H2O: Just Add Water: Episode List

1- "Metamorphosis"
Airdate: July 7, 2006

Three fifteen-year-old girls—Emma Gilbert, Rikki Chadwick, and Cleo Sertori—find themselves stranded out at sea in a dinghy, and drift onto the beaches of Mako Island. Once there, they discover a hidden, underground cavern, and inside it, a deep pool of water, sitting within the cone of a volcano. Realising that the pool, which has an underwater tunnel connected to the ocean, is their only way out, the girls step into the water and find themselves bathed in the light of the full moon as it passes over the top of the volcano. Little do they know, as they swim out of the tunnel and are rescued by the water police, that they have undergone a magical transformation, and their lives will never be the same again. Ten seconds after they touch water, they turn into mermaids. Cleo and Emma discover that they have powers to control water.

2- "Pool Party"
Airdate: July 14, 2006

Miriam, is having a pool party that the girls don’t want to miss. But it is a risky activity for three mermaids: their secret could be out. Spurned by Lewis, Rikki discovers her mermaid power is to boil water at will! For a hot-head like Rikki, this is dangerous. Meanwhile, Cleo’s close friend Lewis is getting closer to finding out about the girls; almost busting Emma and Rikki, as mermaids. At the pool party, Cleo’s plan not to go swimming goes out the window as Zane and his mates toss her into the pool. But luckily the guys walk away before she turns into a mermaid. The only thing is – she needs someone who’s not a mermaid to get her out – Lewis. Emma uses her power to freeze the lock on Miriam's door, locking the rest of the party guests inside.

Lewis is extremely shocked at first, but despite that he helps Cleo get out of the pool and promises to keep their secret. Once out of the pool, Rikki finally gets to use her power. Rikki uses it to evaporate all the water on Cleo, making Cleo return to her human form. On their way out of the party, Rikki uses her power to evaporate all of the water in the pool..

3- "Catch of the Day"
Airdate: July 21, 2006

Emma and Rikki use their new-found abilities to free hatchling sea turtles caught in fishing nets. But when they shred one of the nets with a knife, they spark stories of sharks patrolling the waters. Meanwhile, Emma and Rikki have bad news for Cleo; the fishing boat that caught the turtle in its net was her father's. Refusing to believe that her father is illegally catching turtles, Cleo swims after his boat to investigate and at last accepts what she is. But the fishermen on board the boat mistake Cleo for a shark and catch her in their net. Emma and Rikki rescue her and Cleo is no longer afraid to swim in the water.

4- "Party Girls"
Airdate: July 28, 2006

A worried Emma cancels her annual sleepover party when she realises the risk of growing a tail in front of all her guests. She and Lewis travel back to Mako Island to try to find out how the girls were transformed into mermaids, and Emma finds a mysterious locket at the bottom of the Moon Pool, and thinks that it may be important. Meanwhile, Cleo gets a job at the marine park's dolphin tank, and Emma is furious with her for taking such risks around water. But Cleo's determination to lead a normal life without being scared of every drop of water she sees convinces Emma, who reschedules her sleepover. But there is trouble in store when Miriam, upset that she wasn't invited to Emma's party, gate crashes with Zane. At the party, Cleo gets water on herself, and has to hide in a closet, but when the other girls at the party open the door, she has already managed to zip herself up inside a sleeping bag. The girls, however, almost feel Cleo's tail, and she has to use her power to blow up the drinks as a distraction. Jealous Miriam then tries to steal Emma's locket, but Rikki stops her, and gives it back to Emma. Emma then gives it to Cleo, saying that a mermaid who can hide her tail in the middle of a party is more than capable of taking care of so important a locket. Also, Cleo is confused when she is approached at the marine park by a strange old woman who seems to know her secret.

5- "Something Fishy"
Airdate: August 4, 2006

Cleo's secret diary falls into the hands of her younger sister, Kim. Kim grows suspicious when she reads in the diary that Cleo and her friends are mermaids, and shares her ideas with Emma's brother, Elliot. At first, Elliot doesn't believe her; but when Emma accidentally freezes his shower, Elliot becomes convinced that his sister is part of an evil mermaid cult. To put the kids off the scent, the girls decide to make them think that the diary is about someone else, and choose Miriam as their decoy, using their powers to make it look as though Miriam has powers of her own. Meanwhile, an oblivious Miriam enters the Miss Sea Queen pageant, and taunts Cleo, who decides to enter the pageant herself – unaware that Kim and Elliot are planning to shower the stage with water to expose Miriam and Cleo as mermaids. Lewis goes to Mako Island to investigate the moon pool in order to find out how the girls became mermaids.

6- "Young Love"
Airdate: August 11, 2006

In an attempt to show off, Elliot goes surfing and nearly drowns; Rikki is forced to save him, and ends up with Elliot developing a crush on her. The girls turn to Lewis for advice when the crush gets out of hand but the abrasive Rikki has a hard time letting him down gently, resulting in him running away. When Rikki finds him to apologize, she risks revealing the mermaid secret about herself to him by Elliot and her almost being locked in a green house that was about to water the plants. Emma, Cleo and Lewis come to the rescue. Rikki and Elliot become friends.

7- "Moon Spell"
Airdate: August 18, 2006

Emma is bustling about, trying to arrange the party for her dad. Cleo and Rikki stop by and find her in a right state of fussiness that bothers Rikki. Later, Cleo is working when Miss Chatham appears and warns her not to look at the full moon or its reflection, also she reminds her not to touch water because it is dangerous before disappearing Chatham a as Emma and Rikki arrive, leaving Cleo worried.

That night, at the party, everyone is there and Emma is getting a drink when she sees the full moon and transforms into a wild girl! She offends lots of people before Cleo takes her outside. But Cleo leaves her so Emma jumps into the sea and swims to Mako Island. When she comes back, she pulls Lewis in with her! Rikki tries to dry her, but Emma can't transform!

They put her in the spa and ask her to stay. But after they leave Byron comes past and Emma flirts and kisses him. Elliot sees this and alerts Cleo and Rikki and they break them up. Lewis comes with Grandma Gilbert's wheelchair and they sneak her away. But Emma causes even more trouble-freezing Zane and Miriam's lips together and pinching Byron's butt! Everyone wants to hear Emma's speech, but she's eating all the food before eating time so Cleo improvises one. Soon, people begin leaving because Emma ate all the food for the party so the girls and Lewis take Emma to JuiceNet, where she turns back into a human the following morning. The wild girl goes home and apologies to her dad before going back to the JuiceNet and discovering she kissed Byron! After he tells her that she has the world's best lips.

8- "The Denman Affair"
Airdate: August 25, 2006

The girls reluctantly let Lewis use Dr. Denman's Equipment to learn more about their transformation. Lewis applies for a job as Dr. Denman's assistant. Cleo feels Jealous because Lewis seems to have a crush on her. Dr. Denman hires Lewis but makes him do the cleaning. Lewis takes a DNA sample of Cleo. Lewis puts a bit of the toenail clipping (Cleo's DNA sample) and looks at it through a microscope. Dr. Denman catches him and he leaves some of the DNA sample behind. Dr. Denman analyses it and then adds water. The cells change completely. Lewis realizes what he has done and goes to get it back- only Dr. Denman has kept half the sample. Lewis tells the girls what he did. Rikki and Emma decide to keep an eye on him. Lewis and Dr. Denman go to Mako Island. The girls follow him and Lewis sees them, but Dr. Denman doesn't. Cleo gets even more jealous of Dr. Denman. She offers Lewis a 6 month tour for research. Lewis talks to Cleo about her offer, and she tells Lewis to go for it. Cleo sneaks into Dr. Denman's lab and realizes Dr. Denman is researching what happened to the clipping. A security guard catches Cleo and lets her off with a warning. Cleo tells Lewis what she saw. Lewis tries to defend Dr. Denman but fails. Rikki and Emma try to get the DNA sample back, while Lewis and Dr. Denman talk about the sample. Dr. Denman says "Why do you think I want you on my team? Can you get me another sample like that?" the girls think Lewis will tell Dr. Denman what the sample is and where it came from. Cleo goes to talk to Lewis but Dr. Denman's boat is gone. Cleo wants to chase after Lewis, but he comes up behind them and says he got the sample back and deleted her work.

9- "Dangerous Waters"
Airdate: September 1, 2006

One of Cleo's pet fish has died. Rikki, in the attempt to make up for her brusqueness, tries to find her a replacement fish. She uses her mermaid powers by diving where no fish collector can dive and picking out a fish that strongly resembles Cleo's lost one. She meets Barry Rollins who offers her to pay her well if she sells him fish like the one she was bringing to Cleo. Rikki agrees, believing that the man is what he says he is (a marine park breeder of rare fish), but when she learns the man who hired her is lying and actually is selling the fish illegally to earn large profits, she takes it upon herself to get revenge and deliver him to the authorities. Rikki uses her powers to attack the man, Cleo and Emma eventually tell her that she has done enough.

10- "The Camera Never Lies"
Airdate: September 8, 2006

A short film contest on the subject of heroes captures the focus of the girls' attention, but a film about Emma's mother is not Rikki's idea of fun and she decides to use her abilities to capture some impressive underwater footage of sharks. Ineligible to compete himself as his father is on the judging panel, Zane recruits Lewis McCartney to document a recreation of his father's famous windsurfing trip to Mako Island and gets trapped by sharks on the shore. Luckily, Rikki was also there filming her "masterpiece" and manages to scare the sharks away with her powers. Rikki quits from the contest because she has to explain from where she shot the film. Emma also quits because her mother said she rescued Zane's father from drowning.

11- "Sink or Swim"
Airdate: September 15, 2006

Emma is flattered when local surfing hero, Byron, asks her to train him up for a swimming competition, but has to turn him down for obvious reasons. However, she changes her mind after learning that Zane is boasting to everyone that he will beat Byron by a mile, and begins training Byron without getting in the pool herself. But Byron is disappointed when Emma turns into a ‘heavy training dragon', and the pair nearly fall out. Emma takes advice from her friends not to be so hard on Byron, but by being nice to him, she gives him the wrong idea, and they end up kissing. Meanwhile, Lewis continues his research on the girls, but Rikki does not like him treating her as a specimen, and tries to annoy him by disrupting his experiments.

12- "The Siren Effect"
Airdate: September 22, 2006

Another full moon approaches. Before nightfall, Rikki enters Cleo up for a karaoke contest, not realizing that she has no ability to sing and Cleo embarrasses herself in front of everybody listening. That night, Lewis and the mermaids sleep at Sertori's House to try avoiding the full moon. Cleo's protective father is suspicious of Lewis' wanting to stay over. While watching an old cheesy horror movie, Cleo catches a glimpse of the moon in a glass of water and starts to reach out for it, but Lewis grabs her wrist and she snaps out of it. She says she has to go to the bathroom and Lewis insists someone go with her, but she says she will be fine.

While in the bathroom Cleo sees the full moon in a reflection in the sink, and starts moving her hand through the water in the sink. Rikki had brought over a karaoke CD and using a mic set up to the speakers and TV, she sings rather badly. Before Emma is able to grab the mic, Cleo grabs it from Rikki and she is suddenly able to sing better than any other girl in town. She also becomes slightly self absorbed and extremely bubbly. Lewis becomes enchanted by the music, and so do other boys across the beach, including Byron. Emma and Rikki try to convince Cleo that this is not who she is, but she is as moonstruck as the boys are to her singing. Eventually, using headphones to pull himself out of the trance and drown out Cleo's enchanting singing, Lewis soon realizes she's become a siren, one of those ancient, mythological mermaids whose voices lured sailors to their deaths, but with Cleo's case while her singing is hypnotic to the boys, It just makes them fall head-over-heels in love with Cleo. When Rikki and Emma leave, Cleo starts walking towards Lewis (who is sitting on her bed) and Lewis, thinking she wants to say something to him, takes off his headphones, and he becomes so enchanted that both he and Cleo lean in and kiss.

Cleo's dad sees this and pulls out Lewis by force, much to his obvious dismay. Emma and Rikki force Cleo to go to bed and even sleep in her room on the floor to try and stop her, bit Cleo simply steps over them and heads downstairs to call a radio company so she can sing for them. All of the town's boys hear her singing over the radio, which causes them to fall into a hypnotic love trance for Cleo. In the morning, hundreds of boys gather on the Sertoris' lawn to hear Cleo sing. Cleo, to her father's irritation, escapes to the JuiceNet Café and sings in front of all the boys; the full moon sinks, causing Cleo's wonderful voice to go with it, thus ending the love trance with her, along with her brief burst of popularity, much to her and all the boys' obvious dismay. She is sad that the boys no longer like her, but her dad reassures her and says that he still loves her, and that he always has and always will. In the end, Lewis comes to Cleo's house both say that they are only friends, but they have strange feelings. Lewis' reaction of a smile after Cleo closes the door shows that although he was under a spell the night before, he does love Cleo.

13- "Shipwrecked"
Airdate: September 28, 2006

At the local boat yard, Emma finally meets the mysterious old woman who has been following Cleo around; Miss Chatham. And she finds her at just the right time, as Miss Chatham has an argument with Zane about an accident involving her houseboat ("Lorelei") and his jet ski, and then collapses from a heart attack. As she is taken away in an ambulance, Zane hears her muttering to Emma that she needs to protect her ‘treasure'. Later, Emma invites the fragile Miss Chatham to stay with her, and she, Cleo and Rikki get to know her better. But upon hearing that she has been evicted from the boat yard, Miss Chatham sets off in the Lorelei before it can be taken away from her but she accidentally damages Zane's Jet Ski. Zane chases after her in his Zodiac pontoon boat, catches up with the Lorelei near Mako Island, and boards the Lorelei. He demands compensation for his damaged jet ski, but Miss Chatham passes out with another heart attack. Emma and Lewis arrive just in time to help Miss Chatham and take her to seek medical care on Lewis' boat. Zane stays aboard the Lorelei, searching for the treasure. Kerosene from a lamp ignites on the Lorelei's engine, and the boat begins to sink, trapping Zane. Emma is forced to dive down to the sinking boat in order to save Zane, and risks him discovering that she is a mermaid, but he just glimpses her tail before he passes out. Emma returns Miss Chatham's "treasure" to her, and it turns out to be a locket (identical to Cleo's locket), containing a picture of three teenage girls; herself and her friends Julia and Gracie, who were all mermaids back in the 1950s (Cleo's locket belonged to Miss Chatham's friend Gracie).

14- "Surprise!"
Airdate: October 6, 2006

Believing there is some kind of mysterious creature living under the sea, Zane mounts an expedition to catch the “monster” - and he wants Lewis to help. At first, Lewis declines until the girls convince him to work with Zane – and run interference. Meanwhile, it’s Cleo’s 16th birthday and her dad has planned an embarrassingly childish surprise party, which you would expect a young girl turning 6 to have, not 16. She decides to escape to Mako Island where she is almost spotted as a mermaid by Zane. When she finally returns she finds Lewis has organized the best present of all – a more mature surprise party at the juice bar.

15- "The Big Chill"
Airdate: October 13, 2006

Wilfred decides to leave Emma in charge of the juice bar while he goes away to a conference. Cleo suggests Rikki help out for the weekend. Efficient Emma is less than impressed to have someone so relaxed on staff and by the end of the first day, Rikki has had enough. She quits. Meanwhile, Miriam decides to annoy Emma and cuts the power to the cool room. On her way out, Emma notices that the cool room’s warning light is on so she uses her powers to snap freeze everything, including, unknowingly, Miriam! The next morning Emma finds Miriam, frozen stiff. Cleo, Rikki, and Lewis come over to help out. Using Lewis' scientific knowledge and Rikki's powers and Cleo's powers they slowly thaw Miriam out. It’s a race against time to thaw Miriam out and not get caught.

16- "Lovesick"
Airdate: October 20, 2006

At the Marine Park, Ronnie will only eat from Cleo’s hand so the head Dolphin Trainer, Mitch calls Cleo at home to come back and help with feeding. Bev overhears part of the conversation and thinks Cleo has a boyfriend. Don is horrified. Suspecting Lewis, he takes him aside for a man to man. Lewis assures Don he’s not her boyfriend so they team up to find out who is. The family phone records point to the Bennett's. Another seemingly suspicious phone call from Mitch is overheard. It seems Ronnie still won’t eat without Cleo so she goes back to help. Bev contacts Harrison to talk about their children. The girls confront Cleo about seeing Zane, but she denies everything. The situation escalates until everyone is sure Zane and Cleo are going to elope. They accuse Zane and Cleo at the Marine Park, where they discover Zane has just been doing research and Cleo has been helping a dolphin.

17- "Under the Weather"
Airdate: October 27, 2006

A rainy day traps the girls at Gilbert's House. One by one the girls pretend to be sick so that Lisa won’t make them go to school and turn into mermaid form in the downpour. They use their magic to mimic symptoms to such a convincing degree that Lisa calls in the doctor and the girls have to try to fool her too. They do it so well that Dr. Holt believes they have a rare tropical disease! She takes blood samples and quarantines the house. Lewis sneaks in and they admit to him they’re faking it. All the families hear the news or the supposedly sick girls and freak out. Then the sun comes out the girls tell everyone they’re feeling better but the doctor wants to be extra careful. She sends in the emergency infectious diseases team to take them away. Luckily, the blood test results come back to say the girls are fine – but Elliot has Measles. This results in Professor Gorman being disappointed at Dr. Holt for wasting his time. The next day Cleo, Rikki, and Emma are getting ready for a dance. Cleo realizes that Kim is eavesdropping on them, and when Cleo opens the door she sees that Kim has come down with the Measles. She amuses that she got the measles from drinking Elliot's water glass.

18- "Bad Moon Rising"
Airdate: November 3, 2006

It’s another full moon and this time the girls are prepared. They decide to moon proof Emma’s house and camp out there for the night. Things seem fine until a glimmer of moonlight from a quickly shut door lands on Rikki. Her powers start to boil everything dry and she accidentally burns Emma. Rikki escapes to Mako so she won’t put anyone else in danger, but there she finds she dries up and burns everything too. Zane, who has been haunted by nightmares of the sea creature who saved him from drowning, is on the hunt to find it. While on his search, Zane sees flames coming from Mako and goes to investigate. He finds Rikki, and under the influence of the full moon, they kiss, causing Zane to pass out from dehydration. The girls arrive with Lewis and quickly take Rikki to the only place Miss Chatham said they’d be safe – Moon Pool.

19- "Hurricane Angela"
Airdate: November 10, 2006

When Cleo's young cousin Angela comes to stay, Cleo's father gives Cleo the responsibility of taking care of her, hoping it will distract Cleo from arguing with her sister Kim. But taking care of Angela brings on challenges of its own, as it appears she is a spoiled brat, who is determined to get what she wants, and, worst of all, has a fondness for water. Rather than taking Angela to the beach to go body boarding, Cleo instead takes her to the safety of the marine park to look at the pelicans Kim is so fond of. But things soon turn bad, when Angela goes missing, and Cleo and the others find a pelican in her house, which Cleo accuses Kim of stealing from the marine park. The real thief turns out to be Angela, who used the pelican as a distraction so that she could go body boarding as punishment Cleo makes Angela clean up after the pelicans at the marine park.

20- "Hook, Line and Sinker"
Airdate: November 17, 2006

Lewis enters the fishing competition but the other competitors see him as a bit of a joke so Cleo swims out to sea to find him an impressive fish to put on his hook. Problem is, it’s a little too impressive. The judges suspect he’s a cheat. Lewis is forced out of the competition. In the meantime, Rikki and Zane get stuck together on a balcony of a fancy hotel. Zane has a fear of heights but Rikki is calm, until Zane points out it looks like rain. Neither happy to be there, they start to talk and find out they actually have things in common. They make a connection and are about to kiss when it starts to rain. Rikki freaks but luckily Harrison arrives just in time and lets them in. Zane and Rikki kiss. Cleo tries to help Lewis and takes Emma with her to search the sea for a school of fish just like the one he "caught" to bring back to the pier for everyone. Lewis is reinstated as the winner.

21- "Red Herring"
Airdate: November 24, 2006

When Byron makes an innocent comment about Emma being dependable, she misunderstands, and thinks he is saying she is boring. Deciding she needs a change, Emma asks Cleo to dye her hair, but is horrified when Cleo accidentally dyes it a bright red. However, the girls discover that, as Emma was a mermaid when she dyed her hair (as dyeing hair involves water), her hair only becomes red when she has her tail. Meanwhile, Zane's investigations into his sea monster mystery lead him to Miss Chatham, and he becomes convinced that she knows something. At first, the girls are unconcerned, as Zane has no evidence that Miss Chatham knows anything; but when they discover that Zane is planning to dive down to Miss Chatham's wrecked houseboat, Miss Chatham tells them of some old photographs of her and her mermaid friends, locked in a metal chest on board. Emma chooses to swim out to the wreck to salvage the photographs, before Zane finds them. But as she swims out of the wreck, Zane sees her (but luckily doesn't recognise her because of her red hair). When the girls find out that Zane now knows about mermaids, Rikki tracks Zane down and says she will be his girlfriend, provided he stops his mermaid hunt. She also warns him not to tell Emma or Cleo about them.

22- "Fish Out of Water"
Airdate: December 1, 2006

Emma and Cleo discover Zane and Rikki are an item and force her to choose – him or them. Rikki is not impressed that her friends have put her in this position and so sides with Zane. Wearing a stunning dress that Zane has given her, Rikki accompanies him to his father’s development lunch, much to the upset of Harrison. Emma is also dragged along to the lunch by her parents. There, they discover that Harrison plans to develop Mako Island into a multi-million dollar tourist resort. Emma and Rikki are horrified and Rikki tries to turn off the investors. At first, Zane sticks up for Harrison causing Rikki to storm out. She swims to Mako island and has nostalgic memories about her and her friends becoming mermaids. She returns dressed like herself and madder than ever, and finally Zane sees sense choosing her over his father. The girls in turn are happy to see Rikki on their side and vow to keep their friendship first.

23- "In Too Deep"
Airdate: December 8, 2006

Rikki is amazed when she sees a locket in a jeweller's shop identical to Cleo's and Miss Chatham's. Miss Chatham reveals that the locket belonged to her friend Julia, the third original mermaid, and Rikki and the others begin searching for the money to buy it for her. But Zane makes a mistake when he lets slip to ex-girlfriend Miriam that Rikki was looking at the locket, and Miriam buys it just to spite her. But another problem comes to the girls' attention when Miss Chatham tells the story of how Julia – a girl with a fiery nature identical to Rikki's – trusted her wealthy boyfriend with her mermaid secret, only to have him betray her. She and the girls are worried that Rikki will make the same mistake of having too much trust in Zane, but when Zane retrieves the locket for Rikki after Miriam throws it in the water, they are relieved to see that she carefully dries the locket before touching it, meaning that she is not willing to share her secret with Zane. The girls give Julia's locket to Miss Chatham, but she gives it to Rikki, and then gives her own locket to Emma, saying that it is right that they are all together.

24- "Love Potion #9"
Airdate: December 15, 2006

With the school's end of year dance approaching, Emma takes up the stressful job of heading up the dance committee. But, while the tough task of organising the dance is bad enough on her nerves, she is also flattened by the news that Byron, who she was hoping would ask her to the dance, is already going with Ice Queen Miriam. Cleo is also disappointed that Lewis is too caught up in his experiments to ask her to the dance, and, rather than go alone, she is forced to ask Nate. The only upside is that Lewis, after days of research and testing, has come up with a formula to make the girls' skin waterproof, and they no longer have to worry about getting wet. But, as the wise Miss Chatham declares, science and magic cannot mix, and Lewis' formula gives the girls an allergic reaction where their skin turns red, and they are forced to flee the dance. Things turn out well in the end, however, as Cleo finally admits to Lewis how she feels about him, and they become a couple.

25- "Dr. Danger"
Airdate: December 22, 2006

Emma is forced to drop out of her family's annual holiday to a water park resort, which upsets her parents and annoys her little brother. But she and the other girls have much more to worry about, when Lewis and Cleo spot their old enemy Dr. Denman's boat anchored near Mako Island. Returning to follow up her discovery of cells that mutate on contact with water (a DNA sample from Cleo that Lewis accidentally left behind in her lab), Dr. Denman and her team of divers investigate Mako Island, and soon discover the Moon Pool – and what is worse, they also find a scale from one of the mermaids' tails. After performing some tests on the scale, Dr. Denman sees that it is identical to the cell sample she stole from Lewis, and realises that he is strongly connected to the whole thing. But she gets even closer to the girls' secret when she meets Zane, and hears his story of the mermaid he saw. At first, Dr. Denman doesn't believe a word Zane says; but when her underwater cameras set up around the entrance to the Moon Pool capture images of Emma, Rikki and Cleo, she and Zane's wealthy father team up to capture the mermaids (although they decide not to tell Zane that one of the mermaids is actually Rikki).

26- "A Twist in the Tail"
Airdate: December 29, 2006

Now that the mermaids have been identified, Dr. Denman continues her pursuit of them by holding Lewis hostage on her boat and using his mobile phone to lure the girls to the Moon Pool, where she traps them. After discovering that the three mermaids are in fact Rikki and her friends, Zane is left torn about where his loyalties lie; with his father, or with Rikki. Eventually, his conscience leads him to set Lewis and the girls free (much to his father and Dr. Denman's annoyance), but the mermaids are not out of trouble yet. Knowing that Dr. Denman and the scientists will still come after them, the girls must make a tough decision. Miss Chatham tells them of the forthcoming lunar eclipse, and says that, if they enter the Moon Pool when the eclipse passes over it, it will draw their powers away from them. As normal girls, the three of them would be of no interest to the scientists, and would be out of danger. The girls make the choice to enter the pool, and while their powers seem to vanish completely, the next morning they find they've become mermaids again: the eclipse only affected them for 12 hours.

1 (27)- "Stormy Weather"
Airdate: September 28, 2007

It's the night of a Full Moon, and all three girls accidentally see it when they open Emma's door. Under its spell, they swim to Mako Island, with Lewis in pursuit. The moon pool enhances their powers due to a special planetary alignment. Rikki is now able to control lightning and fire; Emma can freeze anything without water, create blizzards and control the clouds (in a form of weather control); and Cleo can control air currents and wind. Under the spell of the moon, together they create a powerful electric storm and blow Lewis away. The next day, the girls are surprised when they discover their new powers. Upon arriving at Mako Island, they find a soaking-wet Lewis, who explains everything to them. The girls must work to control these new abilities. Meanwhile, Cleo's parents have divorced, and Cleo is outraged when her father says she must start watching over her sister Kim, starting with a concert.

2 (28)- "Control"
Airdate: October 5, 2007

The new girl at school, Charlotte Watsford, gets splashed when Cleo tries to control the school sprinkler. Charlotte instantly develops a crush on Lewis when she sees him, knowing that they are boyfriend and girlfriend, creating a new rival for Cleo. Lewis has little success when he decides to test the girls' new and unpredictable powers; Rikki lights his plastic shark on fire, Emma explodes the fake penguin, and Cleo accidentally knocks Lewis into the moon pool. Emma helps her brother Elliot deal with a meddlesome team-mate, despite her telling the others to control their powers. Lewis' constant attention drives Cleo crazy, leading her to dump him and become only friends. The artistic Charlotte's "small and precise" brush strokes with her Japanese painting leads Lewis to help the girls in controlling their powers better.

3 (29)- "The One That Got Away"
Airdate: October 12, 2007

Rikki is bothered by Zane's reappearance on the Gold Coast, as she realises she still likes him. With Zane thinking that Rikki gave up her mermaid powers at the lunar eclipse during the war with Dr. Denman, can she manage to keep her secret from him for a second time? Meanwhile, Cleo grows jealous when she sees that Lewis and Charlotte are becoming close friends, and, in a mad rage, she steals Charlotte's diary... and discovers that she apparently already has a boyfriend named RJ. The episode ends with Zane rediscovering that Rikki is a mermaid, when Nate blasts her with water, but he promises not to tell anyone, and they rekindle their relationship. Cleo ends up embarrassing herself when she confronts Charlotte about her secret other boyfriend, and learns that the dates in the diary are meetings for Charlotte's theatre group (RJ stands for Romeo and Juliet).

4 (30)- "Fire and Ice"
Airdate: October 19, 2007

With Emma's parents away for the weekend, Rikki comes over to stay but her behavior rubs off on Emma, who decides to prove that she too can be a rebel. But is she trying too hard? And can she handle the consequences that come with throwing a party? Lewis tries to become more manly when Nate tells him it may have been why Cleo broke up with him. So he agrees to let Nate teach him karate. Cleo gets chocolates and flowers sent to her from a secret admirer; she thinks it is Lewis, but it's really Nate. At Emma's party, Nate tries to kiss Cleo. Lewis angrily realizes what happened and fights Nate. The Gilberts return and conclude the party is Rikki's fault, but Emma owns up to what she has done.

5 (31)- "Hocus Pocus"
Airdate: October 26, 2007

Cleo is upset due to her parents' divorce. Later at school, Lewis shows the girls a book about the mermaid myth. Emma and Rikki leave because the bell rings. Cleo reads the book and sees there are ways to make the wishes come true. Later on at the JuiceNet Café, Cleo shows Emma and Rikki there the ways to make the wishes come true. Wilfred tells Emma a new cafe was opened and the JuiceNet must be closed. Emma decides to shoot a commercial to help business at the cafe so it won't close. Wilfred decides to let Emma to be the star of the commercial to cut down on production costs. At first, Emma doesn't want to, but then agrees. Meanwhile, Cleo and Lewis search the things for the spell.

Later that night, Lewis creates the formula and asks the girls to use their powers at the same time to make the potion work. The girls use their powers at the same time and nothing happens. Lewis says they must put the piece of the formula on the face. Emma disagrees with him and says that she will never put the formula on her face. Rikki decides to do it and puts it on. Rikki asks Cleo and Emma what they want. Emma wishes for a pizza. Nothing happens again and Lewis thinks he did something wrong. Cleo takes some of the formula home with her. As Cleo, Emma and Lewis leave, Rikki heats the formula and also leaves.

The next day, Cleo is taking a bath in her mermaid form. As she puts the formula on her face, she hears Kim yelling to get out of the bath. Cleo says if Kim will scream she will be in the bath longer. Outside, Kim tells Don about this and yells she wants to go for a bathroom without waiting for once. The formula suddenly shines and disappears from Cleo's face. The sprinklers suddenly turn on and shower Kim. Cleo realizes that the potion works. Meanwhile, at the JuiceNet, Emma arrives to the chill room and sees the formula taking over the cafe.

Later on at Cleo's house, Cleo tells Lewis that for a wish to come true the girls must be in their mermaid form. Cleo admits she wishes everything will be like before and says she misses Bev. Lewis receives a phone call from Emma and leaves. Later on at the cafe, Emma yells at Lewis for the situation as he arrives with Rikki. Lewis says the formula which Cleo got is okay, but the formula at the cafe was out of control. Lewis realizes this was Rikki's fault and they try to stop the formula before it will cover the entire cafe. Meanwhile, Don tells Cleo he lost time and Cleo says he also lost mom. Back at the JuiceNet, Emma uses her powers to freeze the formula, but fails. Meanwhile, Cleo is again in the bath and asks Don through the door if he could have a wish what would it be. Don answers Cleo's question and the formula disappears from Cleo's face. Don says this will be cool and Cleo believes Bev will be soon back.

Back at the cafe, the formula starts cover the cafe. Charlotte appears and says she wants a drink. Lewis decides to give her the drink. Lewis accidentally drops the book and the formula soon covers it. Lewis wants to go back and get it, but Rikki stops him. Emma, Rikki and Lewis escape from the cafe. Emma spots Wilfred with the commercial workers and realizes she forgotten about the commercial. Emma decides to stay outside to shoot it. Lewis calls Cleo to get to the cafe right away. Charlotte wants the drink again and Emma runs to bring it. Cleo arrives and she and Lewis run inside the cafe, but are unaware that Charlotte has spotted them. Lewis splashes Cleo with a water from the bottle, but, as she turns into a mermaid, drops the formula. Lewis tries to get it. Emma, Rikki, Charlotte, Wilfred and the workers hear the sounds and Charlotte says Cleo and Lewis entered there. Emma tries to distract Wilfred, because the formula covers the cafe and Cleo is a mermaid.

Inside the cafe, Lewis finds the formula and puts it on Cleo's face. Outside, Wilfred wants Emma to give him the keys and Emma pretends to look for it. Charlotte asks if her the keys are in her pocket. Wilfred takes the keys and opens the cafe, only to see the cafe cleaned and Cleo as a human. Rikki asks Lewis what happened and Lewis claims someone made a wish. Later on at Cleo's house, Don tells Cleo his wish came true and she asks him where Bev is. Don shows her the fish searcher which he won at the lottery. Cleo yells at Don and she says she was thinking his wish was Bev's return. Don tells Cleo he often misses Bev, but they weren't happy together. He says that Cleo and Kim can visit her anytime they want to.

6 (32)- "Pressure Cooker"
Airdate: November 2, 2007

Due to her and Charlotte not liking each other, Cleo becomes concerned with Lewis spending time with Charlotte. Lewis insists things between them aren't as they appear, but perhaps he needs to tell that to Charlotte, who is convinced that he's not over Cleo. To make matters worse, Cleo's dad has invited a woman over for dinner. And just when it appears that welcoming a potential stepmother is the worst of Cleo's troubles, she meets her daughter...Charlotte! When Lewis comes over to convince Cleo that there is nothing going on between Charlotte and him, Charlotte keeps Lewis to herself with the help of her controlling mother, and she purposely asks Cleo if spending time with Lewis would be a problem and purposely spilling flour on her. This upsets Cleo so she, Emma, and Rikki use their powers to ruin Charlotte and Lewis' dinner. The next day, Lewis tries to tell Charlotte that he is not interested in her, but she says that she can wait, causing Cleo to gain a new enemy. Meanwhile, Cleo finds out that Charlotte's mother was only spending the time with Cleo's father to see his fish and decide whether or not to sell them at her restaurant. Cleo feels bad about ruining the dinner and ask Emma and Rikki with her to organize a sea food table at JuiceNet Café and invite Annette Watsford to inspect it.

7 (33)- "In Hot Water"
Airdate: November 9, 2007

Cleo is fired from her job at the marine park for feeding Ronnie the dolphin the wrong food, but Emma and Rikki tell her not to worry, and that her boss will soon call her back. Unfortunately, Lewis, needing the money for a new computer, unknowingly takes Cleo's job, and she vows never to speak to him again. In an attempt to get Cleo her job back, Emma and Rikki use their powers to make Lewis' job ten times harder, but he soon finds them out, and sends them off. But, on their way out, the girls leave the marine park's underwater gate open, and Ronnie the dolphin escapes. When Lewis gets the blame, and his boss threatens to have him arrested, Emma and Rikki are forced to confess to Cleo, and the three of them search the ocean for Ronnie.

8 (34)- "Wrong Side of the Tracks"
Airdate: November 16, 2007

Rikki is embarrassed to tell her friends and Zane where she lives. When Nate and Zane are out riding, Nate steals a tag off someone's busted motorbike. Zane is seen when Nate drives off resulting in a huge rivalry. When Zane tries to return the badge the man comes out and thinks that he's stealing something else. Zane insults him without knowing that the man is Rikki's father! Without anyone knowing, Rikki watches through the window, and only sees Zane insulting her dad. Zane pressures Rikki to let him meet her father, but knowing that he insulted him, ignores him and tries to get away. After much persuasion Rikki takes him to where she lives. He has no problem with it but when he kisses her, her father catches him and throws him out. Meanwhile Cleo is dealing with a problem concerning Charlotte and Lewis' jacket, Charlotte asks Cleo to return Lewis' jacket to purposely upset Cleo, Lewis tries to convince Charlotte that they are only friends but she insists that he is wrong and will do anything to make Cleo jealous. In the end, Zane fixes Rikki's father's bike and they become good friends. Because of this, Rikki gives up from embarrassing and invites Cleo, Emma, and Lewis to her house for a party. While at the party, Lewis gives Cleo his jacket after telling her that he only gave it to Charlotte because she asked him to.

9 (35)- "Riding for a Fall"
Airdate: November 23, 2007

Emma is forced to take her brother Elliot for riding lessons by their mother. She gets jealous of the riding instructor Ash because he is better than her. Ash asks Emma to leave his horse Rebel to graze and warns her not to let the horse graze on the front yard because of weeds but Rebel does without her seeing. Rebel is poisoned and Emma helps him recover by using her powers. Meanwhile, Lewis is nominated for a prize and invites Cleo, but she thinks it is not a good idea since that they are only friends now, but with Charlotte desperate for wanting to go out with him she invites herself along. Later on Cleo shows up and tells Lewis their "just friends" relationship doesn't mean they can't be there for each other. And so she accepts the invitation to the award and leaves leaving Lewis to lie both to Charlotte and Cleo.

10 (36)- "Missed the Boat"
Airdate: November 30, 2007

Cleo fails the biology exam and she must study an entire weekend to make it up, which starts on Monday. Cleo must have help in study, but the helper is Charlotte, not Lewis. While Cleo is studying, Charlotte asks Lewis to bring her to Mako Island to sketch it. When Charlotte arrives to help Cleo, she gives Cleo more homework, so she can spend more time with Lewis. Lewis and Charlotte arrive at Mako Island, but they are followed by the girls. Charlotte tries to make a move on Lewis, but he tries to tell her that they are only friends, but is interrupted by Cleo falling into the water. Charlotte hears it, but Lewis spots Cleo and stops Charlotte from looking. Charlotte mistakes Lewis' actions and kisses him, which makes Cleo relatively angry. The next day, Cleo took her biology exam again and passed. At the JuiceNet Café, Charlotte "makes" Cleo thank her for her tutoring, and Lewis tries to tell Cleo the truth, but fed up with his relationship with Charlotte, Cleo tells Lewis that he can do what ever he wants.

11 (37)- "In Over Our Heads"
Airdate: December 7, 2007

Zane shows Rikki the picture of the boat of his father's friend. He says it was drowned on the storm near Mako Island. Zane also says the Tibetan sculpture was lost underwater and for finding it will come with a huge reward. Rikki thinks Zane would be wasting her time searching for a "garden ornament for his yard" and refuses to find it.

Meanwhile at Gilbert's House, Cleo and Emma are painting their nails as Lewis arrives. Cleo and Emma are angry at Lewis for flirting with Charlotte and taking her to Mako Island. Lewis says he's the only one who knows the secret about mermaids. Emma says Zane also knows and Lewis yells they can't trust him. Lewis tells them that Zane's the exact person they shouldn't trust and that he is the same guy who they can count on. Charlotte arrives and takes Lewis to the beach as he says they should call him if they need him.

At her house, Rikki discovers from her father Terry that they lost money and they might leave the Gold Coast. Later on at the JuiceNet Café, Rikki agrees to find the sculpture. Zane tells Rikki his father's friend said that he's announcing the money reward in the afternoon and tomorrow lots of divers will look for the sculpture. Zane decides that they need to have Cleo and Emma's help and Rikki says they will disagree. But, Zane tells her that she can be very "convincing". Back at Emma's house, Rikki tells mostly everything, but the reward. She tells them that 1,000 divers couldn't find it and Zane just wants to leave it there. Cleo believes it should be in a museum so, persuades Rikki that they could do it. Rikki says it could work with the three of them and looks at Emma. Back at the JuiceNet, Cleo and Emma agree to help Rikki and Zane in finding the sculpture. Zane decides to use a machine with balloons, which he creates, to bring it up and goes with the girls to find the sculpture.

Later on, the girls are searching for the sculpture. Meanwhile at the beach, Lewis tells Charlotte Cleo usually doesn't swim when they went to the beach when Charlotte asks him to go for a swim with her. Charlotte asks him why Cleo hates swimming and Lewis says she loves swimming, just a different sort of "swimming". She then says "Doesn't mean we can't." Meanwhile at Mako Island, Cleo and Emma decide to call Lewis. Emma calls on Cleo's cellphone, but Charlotte shuts off his phone thinking it's Cleo. Moments later, the girls once again search for the sculpture. A few seconds later, Cleo and Emma discover the reward and think Zane has been tricking them. However, Rikki tells them that she knew about it all. She tries to convince them to stay and look but Cleo and Emma leave angrily.

Back at the JuiceNet, Lewis finds Cleo and Emma and they're angry for shutting his phone off. Lewis now sees his phone shut down, but is unaware how. Meanwhile, Rikki finds the sculpture inside the box, after many tiring and exhausting searches. Zane sees she's tired, but Rikki decides to not give up. Back at the JuiceNet, Cleo and Emma tell Lewis what happened. Charlotte arrives and tells them about their date. Meanwhile, Rikki and Zane use the machine to bring the box. Suddenly, the machine gets damaged and the box falls on Rikki's head which knocks her out. Zane jumps into water and rescues Rikki, but she's hurt.

Back at the JuiceNet, Emma receives a phone call from Zane about Rikki. Before leaving, Lewis is mad at Charlotte for shutting down his phone. Charlotte explains that they were having so much fun that no one should have disturbed them. Back at the Mako Island, Rikki can't wake up. Lewis uses his smelling salts to wake her up and Rikki finally wakes up. Later that night at Emma's house, Rikki recovers from being hurt and admits everything. She explains she wanted to use the money to pay for her father's bills so she wouldn't move away. She didn't tell anyone because she didn't want "charity". The next day, Lewis and Zane bring the sculpture and gives Rikki the reward. She doesn't accept it at first. But, they explain that she found it and did most of the work. She then accepts the money and they have a group hug. Lewis' gets the barbecue happening, and jokes about someone eating all the vegetarian.

12 (38)- "Fish Fever"
Airdate: December 14, 2007

The girls are looking for some coral to comfort one of Cleo's new fish, Hector. Emma finds a strange rainbow coral, but she ends up cutting herself on it and starts to act crazy, getting an over-excessive want for seafood. Meanwhile, Hector begins to have the same symptoms. At the marine park, Emma swims in the pool, but is seen by a little girl. When Lewis and Charlotte have a date at the marine park, Charlotte dislikes the date, because it isn't romantic, and leaves Lewis to guard her purse so she could go to the toilet. Lewis later listens to the little girl telling her mother about that she saw a mermaid (Emma). Luckily no one believes the girl. While searching for Lewis, Charlotte bumps into Cleo, and thinks Cleo is trying to destroy the date. After bringing Emma back home, she splashes herself with water, but, when she turns into a mermaid, some changes appears on her. Emma then blames the coral for this situation. While Cleo struggles with more problems with Charlotte, Lewis seeks helps and Laurie develops an antidote that works and cures Hector. Lewis takes some of it to save Emma, while she suddenly escapes to find more fish food. The search fails. A little girl tries to prove to her mother she really saw Emma, so she goes to the pool, but a mysterious hand attacks the girl. The girl runs away as Lewis appears. Lewis discovers the one who attacked the girl was Emma, and finds out Emma escaped only to find the food. Lewis explains that to the girls and they run to find Emma, but they're unaware she passed them continuing searching for the food. Later in the evening, Emma's parents are celebrating their wedding anniversary when Emma goes back to her house. Emma eats the lobster which was supposed to be a dinner for the celebration. Emma's parents hear the noises and think there are burglars in the house. Emma shuts of all the power in the house as Cleo, Rikki and Lewis arrive knowing that Emma was back home. Emma's mother discovers the lobster's disappearance. Cleo, Rikki, Lewis and Emma's parents go upstairs to find "burglars". So they don't see Emma; Cleo, Rikki and Lewis persuades Emma's parents to check on the other rooms while they check Emma's room. As Cleo, Rikki and Lewis enter to her room, they see Emma as a sea monster desperately eating the lobster. While Lisa Gilbert fixes the power to the house, Lewis splashes Emma with the antidote while Cleo and Rikki try not to let Emma's parents see their daughter as a monster. Emma returns to normal and ends up grounded when her parents see around her the pieces of the lobster.

13 (39)- "Moonwalker"
Airdate: December 21, 2007

The revived Sertori family camping holiday is ill-fated, not just by choice of location, Mako Island, but in the unfortunate timing of coinciding with the Full Moon. Cleo's friends and Charlotte tag along to help one another stay out of trouble but Lewis' plans are soon tested. Later that night, Lewis and Charlotte go for a romantic walk. Discovered Charlotte's disappearance, Kim opens the "moonlight proof" tent, causing Cleo to get affected by the moon. Kim finds Lewis and Charlotte, who almost kiss. Lewis takes Kim back to the camp, leaving Charlotte alone. Emma and Rikki eventually discover Cleo is gone. Despite Lewis' protests, they leave the tent and face the powers of the moon. Charlotte bumps into Cleo, and then makes fun of her because she thinks Cleo is jealous of her new relationship with Lewis. Angry, Rikki, and Emma, who are watching nearby, strike the ground near Charlotte with lightning. Scared, Charlotte runs away and finds the Moon Pool, which may have unforeseen consequences. The girls defeat the power of moon, and Emma freezes the Moon Pool so Charlotte can't become a mermaid. Lewis arrives and brings Charlotte back to the camp. The next day, the girls and Lewis have to find out Charlotte is a mermaid or not. Lewis "accidentally" squirts her with his drink to find out, but nothing happens beyond her getting wet and upset.

14 (40)- "Get Off My Tail"
Airdate: December 28, 2007

Cleo begins to realise that she misses spending time with Lewis, and asks her friends for advice. Rikki tells Cleo to re-establish her friendship with him, and use her unique mermaid abilities to her advantage – after all, Charlotte is just an ordinary girl, but Cleo is not. But Charlotte soon realises what Cleo is doing, and uses her bond with Lewis to make her rival jealous. Meanwhile, Wilfred leaves the Gold Coast, and Emma thinks that he has left the JuiceNet cafe to her, until the new manager shows up... and it is Ash, the cute riding instructor. Ash makes several quick changes to the cafe, which annoys Emma. But just as Emma is starting to accept Ash, some food gets stored in the wrong place and spoiled, and Ash, believing that it must have been Emma because she was the only one protesting about the changes, fires her. But he later finds out that it was another member of staff who simply got confused because of the quick changes, and gives Emma her job back. He also asks her out on a date which she accepts.

15 (41)- "Irresistible"
Airdate: January 4, 2008

Nate tries to convince Cleo's father of allowing him to take Cleo on a date by teaching Kim guitar lessons, but Cleo is annoyed at Nate for following her all day. She threatens to call the police and say that he is stalking her. When he learns about myths considering ambergris, a substance which attracts mermaids, Zane seeks the help of Lewis. But Lewis thinks nothing of it (Zane tries to convince Lewis that he could use it to win Cleo back, but Lewis quickly ignores him not wanting Zane to know that he still has feelings for Cleo even though he is dating Charlotte) and leaves the bottle of ambergris Zane bought on the table outside JuiceNet Café, where Nate finds it and sprays it on himself. Everyone else in the cafe leave because of the smell, but Emma, since she is a mermaid reluctantly falls for Nate and is soon followed by Cleo and then Rikki (to Nate's enjoyment since he lusts for Cleo and loves the attention from girls).

Lewis and Zane, both jealous, try to talk some sense into the girls but they ignore them, then they follow Nate to the shore where he asks them to come along and swim. Nate uses this opportunity and says whoever swims to a certain point and back first, gets a kiss. Lewis and Zane were looking for the girls and Ash tells them what had happened (who thinks that Emma does not like him so she hangs with Nate). When Lewis and Zane go to the shore, they find Cleo, Emma, and Rikki walking towards the water. Fortunately, the salt water washes Nate clean of ambergris; the girls regain their senses just as the water touches them. While Zane and Lewis distract Nate, the girls run off and keep Nate from seeing them. Lewis and Zane take the bottle and drown it. Emma apologizes to Ash for "falling" for Nate.

16 (42)- "Double Trouble"
Airdate: January 11, 2008

Lewis is troubled by a recurring dream about Cleo being discovered as a mermaid and Cleo saying that she misses him suggesting that he still cares for her. When Elliot asks Lewis for advice about girls, no one suspects he's planning on asking Kim Sertori out. Cleo and Lewis join the young couple on their first date to the marine park and while it takes Elliot a bit longer to learn his lesson, the chaperones also come away a little wiser...and wetter. Cleo and Lewis realize that their friendship is strong and no relationship can stop that. Cleo gets splashed by water so she jumps into a show pool. Afraid his dream coming true, Lewis has to help her protect her secret; he does so by finding the orange bear Kim threw into the river and claiming that's what looked like Cleo's orange tail, later Cleo thanks him and they have a very awkward intimate moment which is disrupted by Charlotte. Meanwhile, Emma gets the wrong idea about Rikki's secret meetings with Ash which were actually intended to give her an award.

17 (43)- "Moonstruck"
Airdate: January 18, 2008

Cleo and Rikki are at the moon pool discussing about the full moon. Rikki explains Emma's family leaves for a weekend. Later on at the JuiceNet Café, Ash decides to take Emma out for a date tonight, but he doesn't know there is a full moon. Emma tells Ash she can't go for a date because she has to guard her house in her parents' absence. Emma leaves to change, but Cleo and Rikki catch up with her. They ask Emma to go for a date with Ash in another night. Emma tells Cleo and Rikki that being a mermaid kills her social life. Rikki tells Emma that Zane knows about all and it's safe. Emma refuses to tell Ash about her mermaid secret and asks them to let her change. Cleo and Rikki find Ash and to be firmer in his attempts to woo her.

Later on at Gilbert's House, the girls finish covering the house. Lewis arrives, but he's too late. The girls push him out because he has a date with Charlotte. Later that night, Cleo goes outside to check the windows, but she knows what the time is. Rikki hear a knock and let someone enter. The visitor is Ash with a dinner and comes back outside for more things for the dinner just as Cleo comes back home. Cleo finds a bag with a dinner. Ash finds Cleo and asks her to hold the food plate, but she catches the glimpse of the moon because he didn't close the door. Cleo then leaves to Emma's room to Emma and Rikki. As Emma goes downstairs, Rikki sees Cleo laughing and asking to go swimming at Mako Island (The moon's effect on Cleo has made her a bit childish and immature, and like Emma in Moon Spell, wants to only swim at Mako Island). Rikki realizes Cleo was affected by the moon, so she goes downstairs to find Emma.

Meanwhile, Emma finds Ash. At first, she wants to kick him out, but refuses because of the moon. Emma and Ash begin talk romantically, they almost kiss just as Rikki appears. Rikki asks Emma to go upstairs to find out what happened. Back at Emma's room, Emma discovers Cleo has been affected by the moon and realizes this was Ash's fault. Rikki tells Emma that she and Cleo didn't know Ash was coming at the time of the moon. Rikki asks Emma to go downstairs to Ash as she's guarding Cleo. Cleo uncovers the window and makes Rikki "moonstruck" as well.

At the bathroom, Cleo and Rikki decide to take Emma to the bath and show Ash she's a mermaid. Meanwhile, Emma and Ash begin talk about the secrets. They almost kiss again when Cleo and Rikki show up Emma finds out Rikki has been affected too. Cleo and Rikki use their powers to reveal Emma as a mermaid, but she stops it with her powers. Emma chases Cleo and Rikki upstairs and orders Ash to stay downstairs.

Emma calls Lewis and asks him to come. Emma overhears Cleo and Rikki's laughs from the bathroom. As she enters, Emma begins discussing, but Cleo and Rikki push her into the bath with the water and Emma turns into a mermaid. Rikki comes back downstairs and tells Ash that Emma wants to show him something. Emma begs Cleo to not reveal to Ash she's a mermaid, but she ignores her and uncovers the window causing Emma to be affected too. Cleo leaves the bathroom and finds Rikki taking Ash to the bathroom. Emma tells Ash through the door she wants to show him something. Ash almost enters as Lewis appears and kicks him out.

The next day, the girls are unable to remember anything. Emma sees the dinner still on the table and says she can't remember what happened then. Later at the cafe, Lewis and Ash talk before the girls enter. Emma and Ash start talking. Emma asks Ash if he remembers the talk about the secrets and explains she wanted to reveal a secret to him. Emma tells Ash she really likes him and they kiss as Cleo, Rikki and Lewis clap.

18 (44)- "The Heat is On"
Airdate: January 25, 2008

Cleo wants to organize a celebration to mark the girls one year anniversary of becoming mermaids. Meanwhile, Lewis and Charlotte decide to have a picnic. At the JuiceNet, Zane accidentally splashes Emma in drinks and hides inside the chill room. Zane tries to distract Ash, but ends up getting kicked out.

At the same time, Cleo tells Lewis about the anniversary and invites him to her house to celebrate. Lewis is forced to make terrible choice: Have a picnic with Charlotte or celebrate with Cleo. Thanks to Zane and Ash's conflict, Emma and Rikki start arguing and Cleo is stuck in the middle of her feuding friends.

The next day, the anniversary day, Cleo tries to stop the argument, but fails. After Cleo returns from school, she finds out that Don wants to sleep and get up at midnight, so Cleo is unable to have a party at her house. Lewis decides to have a meeting. Later on at the beach, Cleo meets up with Emma and Rikki, but the problem is: Zane and Ash also show up. Cleo wants to stop the conflict. Zane and Ash are fighting and Cleo stops them. Cleo yells at Emma and Rikki and they decide to go to the party. Cleo also says Don disagreed to have a party at her house and she decided about Mako Island.

Lewis tells Charlotte he must help Cleo. Back at the JuiceNet, Zane and Ash are having the match: If Zane wins, he will return to the cafe or if Ash wins, Zane will never come back. Emma and Rikki arrive and watch the match. Meanwhile at the Moon Pool, Cleo and Lewis organize the party, but Emma and Rikki are absent for the long time and Lewis tells Cleo he has to go to a picnic with Charlotte and leaves. Back at the JuiceNet, Emma and Rikki use their powers to cheat to let Zane or Ash win. Lewis arrives and Emma and Rikki realize they had forgotten about the party.

Meanwhile at Mako Island, Cleo is sad and alone and watches the slides of her times spent with Emma and Rikki. Back at the JuiceNet, Zane and Ash see the disappearance of Emma and Rikki. They end the conflict and Ash finally lets Zane get back to the café.

Lewis finds Charlotte and they finally have the picnic. Back at Mako Island, Emma and Rikki hurry to the party, but see no sign of Cleo. Emma and Rikki apologize to each other for the argument. Cleo shows up and Emma and Rikki apologize to her too. Then the girls celebrate their anniversary at the Mako Island.

19 (45)- "The Gracie Code, Part One"
Airdate: February 1, 2008 219

While looking research trying to uncover the secrets of the moon pool, Lewis uncovers the work of Max Hamilton, who fifty years earlier found himself in much the same role that Lewis is in now. Max realizes Cleo is one of the mermaids when he spots her locket - the very same one he made for Gracie, one of the original mermaids, fifty years ago. Lewis takes him the locket to get it fixed and Max reveals that he knows what Cleo is. Max tells Cleo and Lewis he created the lockets, loved Gracie, tried to discover Mako's secrets and being dumped by Gracie. When Cleo is out of earshot, Max tells Lewis that Cleo and Lewis should never have broken up because he "knows when people should be together". Lewis discovers a powerful ally in Max, who helps him continue on with his research. Charlotte is upset because Lewis now is avoiding her.

20 (46)- "The Gracie Code, Part Two"
Airdate: February 8, 2008

The girls and Lewis are working on the research. Cleo finds the pictures of Max and Gracie. Charlotte calls, because Lewis was meant to meet her at the JuiceNet half an hour ago. Lewis hurries there and Charlotte is angry that Lewis is spending time with the girls. Lewis consoles her by telling her that they were just meeting to work on a project.

Back at Cleo's house, Cleo finds a film and begins to watch it by unrolling the film, but she only sees some pictures of Max fishing, and so Emma hurries to her work. Later on at the JuiceNet cafe, Ash asks Emma if they can go for a swim at the beach later. Emma lies to him and says she hates swimming and does not go near water any more supposedly because of an accident involving water which caused her to stop swimming forever.

Meanwhile, Charlotte arrives to talk to Cleo about why she and Lewis have been spending so much time together. Charlotte asks about the so called project that the girls and Lewis are working on and Cleo and Rikki attempt to persuade Charlotte that that it is all just junk from a market. Unfortunately, Charlotte sees Gracie's picture and reveals Gracie is her grandmother.

Later on, Cleo and Rikki tell Emma and Lewis about this. Lewis meets up with Charlotte and Charlotte says Gracie always told her sea stories when she was younger. Then Charlotte notices the locket that Gracie is wearing in the picture and is shocked because Cleo, Emma and Rikki all wear identical lockets, much like the one Gracie used to wear. Meanwhile at the beach, Ash decides to help Emma to overcome her "fear of water", by meeting her at the beach and picking her up and standing in the water. Emma yells at him and Ash carries her back on to the sand. Emma decides to reveals her secret to him and nearly does so, but then some swimmers show up and Emma says "maybe later" and walks away.

Later on at Charlotte's house, Charlotte and Annette talk about what Gracie was like and about her unusual jewelery; how she would never wear anything that somebody else also wore. Charlotte asks about the locket but Annette had never seen it before. The next day, Lewis goes to Mako Island to talk with the girls. Meanwhile, Charlotte arrives at Cleo's house and convinces Kim to let her go into Cleo's bedroom to get something for a project. Kim, wanting to make Cleo angry by letting someone into Cleo's bedroom without her permission, lets her and Charlotte take the film. Back at the JuiceNet, Ash apologies about taking Emma into the water and suggests that they start with the pool first.

Later on at Cleo's house, the girls notice the disappearance of the film. Cleo starts to accuse Kim for taking it as she as the only one home and then Kim confesses that Charlotte came to the house and went into her bedroom to get things for their project which was a lie that Charlotte had made up to get access to the film and pictures.

At the Mako Island, the girls tell Lewis that Charlotte has taken the film. Back at the JuiceNet, Charlotte watches the film and sees the part of the film in which Max tossed Gracie into the Moon Pool, turning Gracie into a mermaid. Lewis arrives to see the last bit of the film; Gracie waving to the camera in the pool, with a tail.

A couple of minutes later, outside the JuiceNet, Lewis attempts to convince Charlotte that it was just a bunch of kids mucking around and that mermaids do not exist. Back at Cleo's house, Lewis tells the girls what happened and the girls order him to stop Charlotte, at all costs.

21 (47)- "And Then There Were Four"
Airdate: February 15, 2008

The girls order Lewis to get rid of Max's research. Lewis protests, but then he decides to give it back to Max. After they leave, Charlotte appears and shows Lewis the pictures from the film. She shows the picture of Max and says she knows about him, because she found one of Gracie's sketches. Charlotte asks Lewis in help in looking for him, but Lewis disagrees. Charlotte sees the bag with the research inside Lewis' backpack.

Later on at Max's house, Lewis gives back the research and lets him to guard it, but he's unaware Charlotte has followed him. Moments later, Charlotte meets Max and wants to discover the all secret. Meanwhile at Sertori's House, Emma asks Cleo she covered the home from the Full Moon, but the problem is: Cleo haven't got the home to herself. Cleo tries to ask Don can Emma and Rikki stay for night, but he disagrees. Back at Max's house, Max tells Charlotte she reminds Gracie. Charlotte tells him Gracie told her the stories about the sea. Charlotte shows the picture of Gracie as a mermaid, and asks him if Gracie really was a mermaid. Max says she was.

Back at Cleo's house, Lewis tells the girls that Charlotte knows about Max. Emma asks Cleo what about the moon, and Cleo is still trying to figure out how to make Don agree. Rikki decides to go for a swim. Meanwhile at Max's house, Charlotte asks Max how Gracie became a mermaid and Max says the magic will happen at the right place at the right time. Charlotte asks if it was difficult to keep this as a secret. Max tells her, that she also must keep it a secret, and Charlotte says she'll never talk about this. At the JuiceNet Café, Charlotte yells at Lewis for lying and tells him, she found out that Gracie was really a mermaid. She also says she was talking with Max, because she followed Lewis and saw how he returned the research. Charlotte wants to know the truth, but Lewis can't tell her, and Charlotte runs away from him.

Later on, Charlotte again watches the film. She discovers the place of the transformation is Mako Island. Charlotte goes to Mako Island, and arrives to the Moon Pool. Suddenly, the girls arrive and Charlotte hides. Shocked, Charlotte sees their tails and discovers their secret.

Later on at Cleo's house, Cleo tells Don they must stay for the night, because of the "homework about the moon". Lewis arrives and tells the girls Charlotte has followed him. Lewis tells Emma, he and Charlotte started an argument and she disappeared. Rikki decides to find Charlotte, but Lewis protests, because the moon will soon rise. Emma is worried that Charlotte knows about the secret. Rikki asks Lewis if Charlotte is still unaware of them and Lewis says Max was talking only about Gracie. Meanwhile on Mako Island, Charlotte touches the pool, but it's too early for being active. At Cleo's house, while the moon rises, Lewis tells Cleo he and Charlotte almost broke up. Lewis says he didn't tell Charlotte the secrets, only lied. Lewis then says he liked talking with Cleo and he misses it. Cleo says she liked and missed it too, and lets Lewis talk with her. Later on Mako Island, Charlotte, upset for not being a mermaid, decides to leave, but suddenly the pool becomes active. Charlotte remembers Max's words "the magic will appear in the right place and time". Charlotte jumps into the pool and becomes a mermaid.

The next morning at Cleo's house, Cleo and Rikki are sleeping, but Emma has woken up and looks at her watch. Emma becomes happy and says the full moon is over and nothing happened. Later on at the harbor, Lewis finds Charlotte standing and decides to break up with her. Lewis tells her, he's sorry for the last day. Charlotte says she was just jealous for the time Lewis was spending with the girls. Lewis tells her they're just friends. Charlotte says these are secrets between him and the girls. Lewis is about to break up with her, but Charlotte says that she knows the truth. Charlotte then says she wants to show him something, and jumps into water. She then shows up as a mermaid, surprising Lewis considerably.

22 (48)- "Bubble, Bubble, Toil and Trouble"
Airdate: February 22, 2008

While swimming, Cleo sees Charlotte as a mermaid. The next day, Cleo runs very fast to school and finds Emma, Rikki, and Lewis. Cleo tries to say to her friends Charlotte is a mermaid, but Emma and Rikki already know because Lewis said. Rikki again blames Lewis, but he confronts her to not play anymore to look for blame. Later on, Charlotte tells Lewis she will be the new member of the "mermaid club" and asks Lewis to no more secrets anymore.

Meanwhile, a PE teacher, Ms. Scarf, finds Emma and Rikki and tells them they hardly ever attended her PE classes, especially with swimming. Emma and Rikki lie to her saying that Rikki is allergic to chlorine and Emma stays back to keep her company. Ms. Scarf tells them they will get an F in PE. Ms. Scarf decides to let them form the beach volleyball team. Rikki says to do the volleyball four people are needed. Cleo appears and Ms. Scarf tells them with Cleo there are three people. Later on at Cleo's house, Emma and Cleo reluctantly decide to bring Charlotte to the "mermaid club", but Rikki disagrees.

Later at the JuiceNet Café, the girls and Lewis find Charlotte. Charlotte says they will be sisters and she knows about "the fear of water thing". Lewis explains there's another thing which she does not know. Later at the Gilbert's House, the girls show Charlotte their powers. Charlotte tries to find out which power she got, but nothing happens. Charlotte tries again, again, and again, but nothing works. Charlotte thinks she haven't got any powers.

The next day at school, Emma tells Cleo she must say nice and positive words about Charlotte as Rikki appears. Rikki yells at Cleo and Emma as she doesn't want to like Charlotte. Ms. Scarf arrives and tells the girls she found the fourth team member. The fourth team member is Charlotte. Later at the beach, the girls and Charlotte train, but soon Rikki and Charlotte are bickering again. Ms. Scarf tells the girls they play with the best team from another school next day. Later at the cafe, Charlotte suddenly moves the drink she had put on the table and realizes she has a power.

Later at Sertori's House, Rikki is still arguing about Charlotte. Charlotte arrives and shows the girls her power which is the same as Cleo's, to which Cleo gets offended. The next day at the beach, the volleyball match starts. The girls and Charlotte are losing badly and then Cleo uses her wind powers to move the ball to win. Lewis then explains this is cheating. Charlotte accidentally tosses the ball to the water. The ball is tossed to Charlotte's side. Charlotte catches the ball, but the ball is wet. Charlotte runs to water to hide her secret and Lewis goes after her. Later on, Charlotte discovers she has a another power which is the same as Rikki's and dries her tail and turn back into a human.

Meanwhile, everybody are discussing why Charlotte ran away. Rikki then laughs as she was right. Charlotte suddenly returns, and the girls and Charlotte win the match at volleyball. Back at JuiceNet, Rikki realizes she made a mistake in not wanting Charlotte to enter the "mermaid club". Rikki then starts wonder how Charlotte dried up so fast. Charlotte soon shows her powers and boils Rikki's drink. Charlotte also shows she has Emma's power. Charlotte then says she must be a "super mermaid."

23 (49)- "Reckless"
Airdate: February 29, 2008

Lewis is fishing at the dock when Nate suddenly rides by him on his jet-ski and splashes him, greatly annoying him. Lewis retaliates by using his fish lure to catch the jet-ski, making Nate fall off it and it ends up crashing on the shore, completely destroyed. An angered Nate threatens Lewis that he'll pay for wrecking his jet-ski, but an indifferent Lewis dismisses him and leaves. At the JuiceNet Café, the girls are waiting for Charlotte. Charlotte arrives and explains she was late because she was attacked and pursued by a dolphin. Cleo truthfully says that the dolphins are good guys. Emma says if Charlotte have the questions she should ask. Charlotte resists and says she has all the powers and can do all three of what the girls can. Cleo then says they will teach her and Rikki laughs she has to make it. Lewis arrives and Charlotte leaves.

Later at the beach, Lewis catches up with Charlotte, who thinks the girls want to order her, and she accidentally reveals she has a fear of dolphins. Lewis decides to take Charlotte to the marine park and meet Ronnie to confront her apparent fear of dolphins. Lewis realizes the only one who will introduce Ronnie is Cleo, so he leaves Charlotte, so she goes to Ronnie. Ronnie splashes her, so she jumps to the pool and accidentally uses her powers on Ronnie. Cleo and Lewis arrive in time to yell at Charlotte to stop. Later on, Cleo and Charlotte argue about Ronnie when Lewis realizes he made a mistake. Cleo explains to Charlotte she has to be careful near the water and that someone could have seen her. Cleo then explains there are few rules in the "mermaid club," but Charlotte again resists. The girls become worried, knowing that if Charlotte continues to act this recklessly, their secret will be discovered.

The next day, Nate, still smarting about the fish-hooked jet ski crash, tells Lewis he has to pay $750 over at 5 o'clock for the jet-ski, but Lewis threatens to counter-sue Nate if the latter sues him first, which Nate threatens to do. Meanwhile at JuiceNet, Emma tells Charlotte she has to carefully use her powers and avoid someone from seeing her use them. Emma then teaches Charlotte how to control her powers. Charlotte finds she is able to control her powers, but then accidentally loses control. Later on, Emma asks Rikki to follow Charlotte.

Later on Rikki follows Charlotte, but she's caught. Later at the beach, Lewis tells Charlotte the girls really want to help in controlling her powers. Charlotte refuses it and thinks she's the only true mermaid. Later at the cafe, Lewis and Charlotte bump into Nate, and Lewis tells Charlotte about the fish-hooked jet ski crash. As Lewis and Charlotte enter the cafe, the girls look angrily at her. Suddenly, Nate shows up and demands $750. Lewis refuses and Nate, still angered, attacks him by tossing him to the floor. Ash kicks Nate out of the cafe. Charlotte decides to retaliate against Nate.

Moments later, Charlotte catches Nate stealing Lewis' boat. Charlotte yells at Nate he will pay for attacking Lewis. Dismissing Charlotte's words, Nate leaves with the boat. Charlotte decides to stop him, but first looks behind herself and sees nobody watching. Charlotte then jumps to the water and attacks Nate with her powers. Everyone in the Cafe suddenly hears Nate's screams as he is being thrown and tossed around while the boat is swaying menacingly back and forth. The girls realize what Charlotte is doing and try to use their powers combined to stop her. Charlotte looks around and sees the people and the girls fighting with her, so she stops the attack and escapes.

Later on at the JuiceNet, Lewis tells the still irate Nate the boat was moving because of the "natural gas." Nate reluctantly decides to give Lewis his boat back and storms out of the Cafe. Ash asks Emma if she believes Lewis' explanation it being natural gas, and she hints at it. Later at Emma's house, the girls are angry because Charlotte used her powers near the people and tell Lewis the people are looking for explanation about the moving boat. Lewis then says nobody will find out that this was a group of mermaids with magical powers, but Cleo explains they needed Lewis's help in saving their secret, and now Charlotte could end up destroying all of it. Back at the beach, Lewis tells Charlotte off for nearly getting herself and the girls in trouble. Charlotte then explains the girls don't worry about the others and they think about themselves and about that what will happen to them. Charlotte then decides to work her mermaid powers on her own.

24 (50)- "Three's Company"
Airdate: March 7, 2008

Lewis and Charlotte meet up at Mako Island, and she shows him her control of her fire powers. Charlotte asks how much time the girls took to learn their powers, and Lewis says only a few weeks. Charlotte says she's better. Meanwhile, Zane is worried about Rikki because she won't explain why she isn't coming on their date. Later, at the JuiceNet Café, Charlotte tells the girls that Lewis' birthday is coming. Cleo suggests a party boat, but Charlotte refuses her idea and decides to arrange the surprise party, much to Rikki's chagrin.

Later on, at Watsford's House, Charlotte meets up with her mother, and suggests having Lewis' party at her house because of her beautiful garden. Annette asks Charlotte to bring the chairs from the pool room. Bringing the chairs, Charlotte notices water dripping from a broken pipe, and freezes it. Back at the cafe, Charlotte's micromanaging of food and music for the party annoys Rikki. She meets up with Zane at the marina, and explains she decided to take a break from Cleo, Emma and Charlotte.

Meanwhile, Charlotte lies to Lewis she promised Annette to clean the pool and needs Lewis' help. At the beach, Rikki and Zane kiss, but Cleo and Emma show up. They try to make amends, asking Rikki to come to the party, but she refuses. Although Cleo and Emma beg her to come, she holds firm.

The next day at Charlotte's house, Charlotte has invited her friends from the old school. Cleo, Emma and Ash (who was also invited to the party) ask about Lewis' friends. Charlotte's only explanation is that they're Lewis' friends. Lewis appears and is surprised. Charlotte introduces her friends to Lewis. When he asks Cleo and Emma where Rikki is, they explain that she has her own responsibilities.

To keep Cleo and Emma from "ruining" the party, Charlotte asks them to bring the chairs from the pool room. As Cleo and Emma enter, Charlotte uses her powers to close the door, freeze the doorknob, and unfreezes the water pipe, flooding the room and turning Cleo and Emma into mermaids. Cleo realizes who's responsible, and gets mad.

Meanwhile, Zane decides to go to Lewis' birthday although Rikki disagrees. Zane says Rikki can't give Charlotte the satisfaction of beating her. Back at the party, to keep Lewis from getting suspicious, Charlotte lies to him that Cleo and Emma left the party. Lewis becomes worried, as does Ash. In the pool room, Emma considers freezing the water, but Cleo points out that they'll be frozen also.

Back at the café, Rikki receives a phone call from Ash about Cleo and Emma's "leaving" the party, to her concern. Cleo and Emma realize Rikki was right about Charlotte. While looking for Cleo and Emma, Ash overhears them, but is unable to open the door. Alarmed, the two try to talk him into leaving, still trying to protect their secret.

Rikki and Zane show up as Ash tries to force the door. While Zane distracts him, Rikki shuts down the water and melts the knob. Entering the pool room, Rikki dries it and her friends off. Emma asks Rikki why she returned, and Rikki lies that she missed them. The other two tell Rikki that she was right about Charlotte, and Rikki decides to do something.

Back at the party, Lewis gets bored and admits to Charlotte that he hates everything she planned. With that, music begins to play and everyone sees the party boat with Lewis' friends. Lewis asks Charlotte if this was also her idea, and Rikki explains this was hers, Emma and Cleo's, making him suspect that's why the other two vanished. Confronting Charlotte, the trio tell her that from now on, she's on her own.

25 (51)- "Sea Change"
Airdate: March 14, 2008

Charlotte's short-lived friendship with the girls is over. She demands loyalty from Lewis by saying he cannot talk or have anything to do with Rikki, Emma, or "especially Cleo". Lewis only reluctantly agrees, hoping it's just temporary. Meanwhile, Cleo is having difficulty evading washing the dishes, since Kim stopped doing it for her, much to Don's displeasure. Upset at her father's pressuring and Lewis's avoidance of her, Cleo escapes and meets Charlotte. Using her unfair advantage - her additional powers and strength - Charlotte beats Cleo in a brief showdown, steals her locket, and tells Cleo that Lewis no longer wants anything to do with her. Rikki and Emma tell Cleo to stay away from Charlotte and Lewis, and no longer listen to her, refusing to help. Feeling crushed, heart-broken and helpless, she tries to call Lewis, but Charlotte has stolen his phone. After sending a heartbreaking voice message explaining how Lewis has let her down badly, Cleo swims into the ocean and runs away from home. Cleo's dad finds out she's missing and calls Emma and Rikki. They both look for Cleo but they can't find her. Meanwhile at the JuiceNet Café Charlotte goes for some juice and Lewis hears his phone ringing in Charlotte's bag and is stunned when he hears Cleo's message. Realizing that Charlotte has been trying to isolate him from his friends, Lewis doesn't hesitate to leave the café with Emma and Rikki, who have arrived and told him of Cleo's disappearance. Meanwhile, Cleo mistakenly winds up in a shark-breeding ground, and finds herself being hunted. After figuring out Cleo's location with Max's help, Lewis heads for his boat, just as Charlotte catches up with him. When Charlotte attempts to remind him that he was no longer supposed to talk to Cleo anymore, Lewis proceeds to interrogate her over why she stole his phone, in the process eventually figuring out that Cleo had not simply given her the locket as Charlotte had claimed. Seeing Charlotte's true colors, Lewis breaks up with her, goes to save Cleo, and gets back together with her after apologizing for his behavior. Unfortunately, by choosing Cleo over Charlotte, Lewis has created an enemy more powerful than they could imagine.

26 (52)- "Unfathomable"
Airdate: March 21, 2008

The final full moon of the season approaches. It will be Charlotte's first one, and to protect their secret, the girls try to warn her. Charlotte angrily retorts that she's "more mermaid than the three of them put together" and thrusts them into the air before dropping them and giving them bruises just as Ash appears. Charlotte is convinced that Lewis made a mistake in choosing Cleo over her and is determined to remove the girls' powers at all costs. That night, while the girls are sealed inside Emma's house, Ash comes over. Tired of the mysteries surrounding Emma, Ash demands an explanation from her, but Emma hesitates. Charlotte purposefully looks at the full moon to make her full of strength and revenge, and begins causing havoc and mayhem in Emma's house by using her powers to control the water and make it spray everywhere. The girls are powerless to retaliate since Ash is in the house and they are not yet comfortable with revealing their secret to him. As Charlotte clearly planned, Lewis asks her to go to Mako Island; Cleo finds out and follows them there. Emma and Rikki then follow to help her. When the three girls are all together at Mako Island, Charlotte and Lewis reveal that this full moon can permanently remove a mermaid's powers and that it is how her own grandmother, Gracie, became an ordinary girl again. The girls battle each other; while Charlotte is stronger than each of them individually, the three girls work as a team to strike down her creations (water snakes), and make her plan backfire on her. As Charlotte falls into the moon pool as the full moon passes over, she is now no longer a mermaid. The next day, Lewis convinces an ashamed Charlotte to give the locket back and return it to its rightful owner, Cleo. Rikki asks Lewis if Charlotte will reveal the girls' secret and Lewis explains that she won't; she gave him her word of honor. Ash, to his surprise, finally discovers Emma is a mermaid and reacts in an overjoyed way to the news. This season ends with Ash, Zane, and Lewis happily watching the girls run into the ocean and swim off as mermaids.

Series three (2009–10) The third series begins with Cleo and Rikki dealing with the loss of Emma who is travelling the world with her family. New characters are introduced including Bella Hartley (Indiana Evans), a singer and mermaid since the age of nine with the power to turn water into gelatine; and Will Benjamin (Luke Mitchell), a skilled diver who is trying to figure out the secrets of Mako Island and who accidentally seems to unleash a powerful force which turns water against the mermaids. The girls must also deal with Zane, who attempts to exploit the moon pool after Rikki breaks up with him.[2][3]

No. Title[4] Directed by[4] Written by[4] Original air date Production code 53 "The Awakening" Jeffrey Walker Joss King 26 October 2009 (UK) 301 Rikki and Cleo are about to face their final year of high school without Emma, who has gone travelling with her family. The JuiceNet cafe has now closed down and is just a vacant building on the coastline until Zane buys it and persuades Rikki to reopen it with him, renaming the cafe Rikki's in honour of her. At the cafe's opening night, Cleo and Rikki meets Bella Hartley, a new girl in town who does Rikki a favour by singing for her in Nate's band. That same night, free-diver Will discovers the Moon Pool and witnesses the full moon's effect on it. A strange creature made entirely of water forms and attacks Will. It then races to the cafe and kidnaps Rikki, dragging her back to Mako Island. To Cleo's horror, this all happens in front of Bella, but she has no choice but to dive in and rescue Rikki. However, Bella dives in after her, revealing that she is also a mermaid. Together, Cleo and Bella rescue Rikki from the water tentacle. Bella befriends Rikki and Cleo and the new trio is determined to find out what caused water to turn against them.

Note: Claire Holt left the series to film Messengers 2: The Scarecrow. Indiana Evans and Luke Mitchell join the main cast. 54 "Jungle Hunt" Jeffrey Walker Anthony Morris 27 October 2009 (UK) 302 First day back at school, and the girls are surprised to discover that Will is attending too. Will is thrilled to see them, and asks for help relocating the Moon Pool, so that he can investigate what happened to him during the full moon. Bella (obviously smitten with Will), offers to help him, but promises the others that she will keep him away from the Moon Pool; but a suspicious Rikki follows her. Meanwhile, Lewis and Cleo are convinced that something has happened to change the Moon Pool, but can't figure out what. 55 "Keep Your Enemies Close" Jeffrey Walker Sam Carroll 28 October 2009 (UK) 303 Bella is pleased and Rikki wary when Cleo applies for a new job as an assistant dolphin trainer at the marine park. But she is soon in over her head, when Will visits the park, and takes a swim with Ronnie, and his influence has the dolphin performing tricks that he has never done before. However, head dolphin trainer Laurie mistakenly thinks that it is Cleo making Ronnie perform the tricks, and offers her a spot in the marine park's dolphin show. Meanwhile, Rikki fires the live band from the cafe after hearing Nate's terrible new song, but Bella gets the wrong end of the stick, and thinks that Rikki fired the band because she has an issue with her. 56 "Valentine's Day" Jeffrey Walker Simon Butters 29 October 2009 (UK) 304 Valentine's Day comes to the Gold Coast, and the girls all seem to be having trouble with love. Rikki finds that the stress of running the cafe is destroying her relationship with Zane, Bella's crush on Will deepens, but she finds it hard to tell him of her feelings, and Cleo is less than impressed with Lewis' idea of a Valentine's date; fishing. Even Kim is having serious ‘boy trouble'. The only person who does seem to be having any luck in love is Cleo's father, Don, who falls for a pretty marine licensing inspector named Samantha. But it seems that he has blown his chance when she gets knocked overboard. 57 "Big Ideas" Jeffrey Walker Philip Dalkin 30 October 2009 (UK) 305 Zane's management style is steering the cafe into debt, and Rikki is not impressed with his new idea to hold a dirt bike race at the cafe to bring in more money. Zane has promised to give the winner of the race a prize of $1000, but, knowing full well that he is the best biker in town, enters the competition himself, so that he won't have to hand out the money. But he starts to doubt himself when experienced dirt biker Will enters the race after encouragement from Bella, and so enlists Nate to help him cheat. Meanwhile, Lewis and Cleo continue with their investigations on the Moon Pool, and make an amazing discovery when they mix water from the new waterfall with water from the pool. 58 "Secrets & Lies" Jeffrey Walker Simon Butters 2 November 2009 (UK) 306 As Bella grows more and more fond of Will, she tries to set up a study date so that they can spend some time together, but is hurt to find herself stood up. Furious, she goes to Will's boatshed to confront him, and is devastated to find him there with another girl. Meanwhile, Lewis' science teacher, Ms. Taylor, is impressed by Lewis' science project – not realising that it is actually his apparatus for studying the floating water from the Moon Pool. Lewis is then forced to show his experiment in class, putting the secret of the Moon Pool and the mermaids in danger. Ignoring Rikki's advice, Bella follows Will and the mystery girl on a diving trip, and they nearly see her, but Bella is relieved when she discovers that the girl is Will's sister, Sophie. Cleo uses her power to help Lewis replicate the effect of the floating Moon Pool water, and he submits an alternative science project, keeping the mermaids' secret safe. 59 "Happy Families" Jeffrey Walker Max Dann 3 November 2009 (UK) 307 Cleo and Kim's father Don takes them to the beach to get to know his new girlfriend, Sam. But while Cleo is willing to accept her for her father's sake, Kim hates her from the start, but uses the situation to get expensive gifts out of her father as bribes for her approval, much to Cleo's disgust. But Sam and Don get the wrong idea when Cleo refuses to go swimming with Sam, and think that Cleo is the one who has a problem with her. Meanwhile, Bella applies for a job at the cafe, and Rikki is keen to give it to her... except Zane wants to give the job to Will's ambitious sister, Sophie.

Absent: Angus McLaren as Lewis McCartney 60 "Kidnapped" Jeffrey Walker Chris Roache 4 November 2009 (UK) 308 The girls prepare to sleep over at Cleo's for the full moon, to try to protect themselves from any water attack. Lewis makes preparations of his own by installing cameras in the Moon Pool cavern, in an attempt to capture the mysterious water tentacle on film, and learn more about how it is created. Will, meanwhile, decides to revisit the Moon Pool to continue with his investigations there, and drops by Cleo's to ask Bella to come with him. But Bella isn't there – she has been kidnapped by the water tentacle! Rikki and Cleo race to Mako Island to save her, while Lewis tries to keep Will away. At Mako, Rikki and Cleo discover that the tentacle seems to be turning Bella into water. But when they manage to pry her away from the tentacle, Bella says that she felt safe when she was with it. 61 "The Sorcerer's Apprentice" Jeffrey Walker Philip Dalkin 5 November 2009 (UK) 309 When Lewis tells Cleo not to experiment with the floating water they collected from Mako, she cannot resist, and sends Lewis off for a day of golfing with her father, so that he won't discover her. But when Rikki accidentally gets the water in Cleo's fish tank, her goldfish, Hector, becomes imprisoned in a bubble of floating water! The girls' attempts to free Hector result in him going down the drain, and they must use their mermaid abilities to retrieve him from the canal. Also, the girls try to keep Will, who is in the house while looking for Bella with whom he has to do a project for school, from seeing Hector. Meanwhile, somewhere on the golf course, Lewis is pretending to lose to Cleo's father at golf, so that he can get into his good books. 62 "Revealed" Jeffrey Walker Sam Carroll 6 November 2009 (UK) 310 When Rikki and Cleo realise that Will has made a connection between Bella, Mako, and the full moon, they warn Bella to stay away from him, but she can't. Will is also growing incredibly interested in her, and wants to spend time with her; but when he realises that Bella won't swim, he deliberately spills some water on her, thinking her secret might be something to do with water. In a panic, Bella dives into the water, but Will follows her... and discovers that she is a mermaid. Afterwards, Bella tells Will how she became a mermaid. Can he keep her secret? 63 "Just a Girl at Heart" Jeffrey Walker Anthony Morris 18 January 2010 (UK) 311 Will's ruthless sister, Sophie, is training him to be a professional free-diver, only he'd rather spend time swimming with Bella. Irritated, Sophie tells Bella to stay away from Will, as she sees her as a distraction for him, but Bella doesn't listen. While watching Will train in a public pool, Bella dives in to help him with his swimming technique... just as Sophie turns up. Although Will manages to hide her, Bella is still worried, not about Sophie, but about Will. She thinks he only likes the mermaid side of her. Meanwhile, Rikki comes up with a brilliant idea to hold corporate events at the cafe, but after Zane makes a mistake with the booking, the cafe is overrun by a wild children's party.

Absent: Angus McLaren as Lewis McCartney 64 "Crime & Punishment" Jeffrey Walker Max Dann 19 January 2010 (UK) 312 On Rikki's birthday, Cleo and Bella travel to the Moon Pool, and make her a present using their powers; an elegant mermaid statue that Cleo moulds from water, and Bella hardens with her gelatine power. But when Will discovers the unusual present on Rikki's desk, he suspects that Cleo and Rikki know Bella's mermaid secret. Meanwhile, Sophie takes it upon herself to organise the cafe's first food delivery order, and sends Will to make the delivery, but he comes back with a payment of fake dollar bills. Realising that something is amiss, Rikki returns the fake bills to the address – a houseboat in the middle of nowhere – and discovers that the people on board are printing counterfeit money. When the criminals take her hostage on board the boat, Rikki manages to get a desperate message to Cleo and Bella, before her captors take her phone, and Bella and Cleo get Will to tell them where Rikki has gone – but not before he makes them admit that all three of them are mermaids. Realising that they must now all trust each other, Cleo, Bella and Will set off together to save Rikki. 65 "To Have & to Hold Back" Jeffrey Walker Simon Butters 21 January 2010 (UK) 313 The day of Don and Sam's wedding arrives, and selfish Kim tries to ruin everything. Meanwhile, Lewis gets the chance to spend three years working at a scientific research centre in America, but frets about telling Cleo... until Kim tells her for him. Cleo is distraught, thinking that Lewis planned to leave without telling her, and refuses to talk to him. Don and Sam's big day is then completely ruined when Kim turns on the sprinklers (nearly making Cleo, Rikki and Bella grow tails in front of everyone). In the end, Lewis tells Cleo that he is not going to America because he loves her, and Cleo forgives him. But she decides to let him go after all, and they part promising to see each other again. The girls organise another wedding ceremony for Don and Sam on Mako Island, and Kim at last warms to Sam.

Note: Angus McLaren's final episode as a regular 66 "Mermaid Magic" Colin Budds Anthony Morris 22 February 2010 (UK) 314 Cleo finds an unusual crystal in a rock from the Moon Pool, identical to the one in Bella's necklace, which she collected from the Moon Pool in which she was transformed. Could this be the source of Moon Pool magic? Meanwhile, after discovering that Zane cheated in a free-diving competition, Will challenges him, and dives to a depth of 60 metres. But Will pushes himself too hard, and ends up passing out, forcing Rikki to dive down and save him. 67 "Power Play" Colin Budds Anthony Morris 23 February 2010 (UK) 315 After seeing the work done at the marine park by the charity Dolphin Rescue, Bella comes up with an idea to hold a fundraising event for them at the cafe, but is deflated when Sophie overhears, and steals her idea, presenting it to Rikki and Zane as her own. What is more, as Sophie is organising the event, she spitefully refuses to let Bella and the band perform. But she gets into trouble with Rikki and Zane, when all of the bands she has booked instead of Bella's pull out, after hearing that Sophie has tried to make Dolphin Rescue pay a fee for the concert. Sophie is fired from the cafe, and Bella and the band perform to save the night. 68 "The Dark Side" Colin Budds Sam Carroll 24 February 2010 (UK) 316 Frustrated by the water tentacle's constant attacks on them, Rikki travels to Mako Island at the full moon in order to confront it. With Bella and Cleo delayed, Will hurries after Rikki, but instead of finding the tentacle attacking her, he finds her somehow controlling it. Rikki appears to form some sort of connection with the tentacle, but when the full moon passes, she makes Will swear not to tell Bella or Cleo what happened. 69 "A Magnetic Attraction" Colin Budds Sam Carroll 25 February 2010 (UK) 317 Cleo is introduced to Ryan, a geophysicist working for Sam. Thinking that he might be able to help, Cleo shows him the magnetic crystal rock she found at Mako, which infuriates Rikki, who thinks that Cleo is putting their secret at risk. Cracks are beginning to form in the girls' relationship, and Cleo and Bella become worried when Rikki starts spending all of her time in the Moon Pool. This prompts Will to confess to them what happened on the night of the full moon when Rikki confronted the tentacle. Back at the Moon Pool, Rikki discovers that bonding with the tentacle has strengthened her powers. 70 "Into the Light" Colin Budds Sam Carroll 12 April 2010 (UK) 318 Kim lets slip to geophysicist Ryan that Cleo and the others spend a lot of time on Mako Island, and Ryan goes there in search of more magnetic rocks like the one Cleo showed him. Rikki discovers this, and tries to warn the others that Ryan is on to them, but Bella and Cleo don't believe her, as they are beginning to lose trust in Rikki. Rikki goes to Mako Island herself (with Will tailing her), and uses her powers to destroy Ryan's equipment, but when she starts going too far, Will springs out, and stops her. The two of them are then forced to run and hide in the Moon Pool cavern when Ryan hears them and chases after them, but this leads to Ryan accidentally discovering the Moon Pool. Rikki forces Ryan out with her powers, but Will tells her that she has only made things worse. Realising that he is right, Rikki apologises, and, when she arrives home, reconciles with the others, and tells them of her experience with the tentacle, and how it has affected her. Rikki says she doesn't think the tentacle is trying to harm them, which opens up a new mystery. The girls must also figure out how they are going to put Ryan off the scent. 71 "Breakaway" Colin Budds Anthony Morris 13 April 2010 (UK) 319 Will is getting sick of Sophie's pressuring him into competitive free-diving, but agrees to compete in a competition to set a new depth record. Sophie is delighted with Will's record breaking dive of 80 metres, but after the competition, Will gives up competitive free-diving to shrug off Sophie's influence. As Will sets his record, however, Rikki witnesses Sophie and Zane kissing, and her relationship with Zane is ended for good. 72 "Queen for a Day" Colin Budds Samantha Strauss 13 April 2010 (UK) 320 After breaking up with Zane, Rikki leaves the cafe in order to get away from him, and Zane re-hires Sophie as the new manager. Thrilled with her new position, Sophie immediately starts making changes to the cafe, and hires Cleo's sister Kim as a waitress. Meanwhile, Will's new after shave gives Bella a sneezing allergy, which also inadvertently triggers her powers. Unable to perform without sneezing (and unleashing her mermaid powers on everyone), Bella is close to being fired from the cafe by the brutal Sophie. 73 "The Jewel Thief" Colin Budds Simon Butters 14 April 2010 (UK) 321 Since saving his life when he passed out during a dive, Rikki has formed a close friendship with Will, and is touched when he makes her a necklace, similar to Bella's, using the magnetic crystal found on Mako Island. Rikki and Bella experiment with their crystals, and are fascinated by how they react when near each other; the crystals produce a blue glow that mesmerises the girls, similar to the effect of a full moon, and, when actually touched together, they release a powerful energy burst, that causes an electrical blackout! The girls decide to keep the crystals apart until they learn more about them, and Rikki leaves hers with Will. But a jealous Zane, mistakenly thinking that Rikki and Will are going out, breaks into Will's boatshed, and steals the necklace. A furious Rikki gets it back from him, and tells him once again that their relationship is over. Will makes another necklace for Cleo, and the girls wear them as a symbol of their friendship. 74 "Mako Masters" Colin Budds Philip Dalkin 14 April 2010 (UK) 322 A stressed out Cleo is trying to plan study sessions for the girls' final exams, but Bella and Rikki are more preoccupied with finding out about the tentacle. The girls are forced to make a quick exit when, during their science exam, the full moon rises early, and the tentacle tries to reach them through a water cooler in the classroom. They travel to Mako Island, and confront the tentacle, this time without fear, and realise that it is not trying to harm them, but get a message to them. The girls all place their crystal necklaces in a hole in the cave wall, triggering a projection to appear in the air. The girls watch it, and see a comet travelling towards the Earth, but before they can watch the whole message, Zane and Will interrupt them, and the projection stops. The girls are confused as to whether the Moon Pool was showing them the past (the creation of the Moon Pool itself), or the future. 75 "Beach Party" Colin Budds Anthony Morris 15 April 2010 (UK) 323 The Gold Coast is playing host to a massive beach party, and Bella wants to ask Will if he will go with her. But she is upset when she misunderstands a conversation she hears between Rikki and Will, and thinks that they are going together. Bella then has no alternative but to ask Nate, which confuses Will (as he was about to ask her). Things are straightened out at the party, however, when Zane tells Will to stay away from Rikki, and Will exclaims that he likes Bella. Bella and Will become a couple. Meanwhile, Sophie is trying to persuade Zane to change the name of the cafe. 76 "Too Close for Comfort" Colin Budds Max Dann 15 April 2010 (UK) 324 When Kim demands an expensive holiday, Cleo's father gets a second job doing a pirate show at the marine park, so that he can afford it. At first, Cleo is worried that her father will humiliate himself; but when the dolphin shows start emptying out, Cleo realises that her father is more popular than she thought, and his shows threaten to end Cleo's job. Meanwhile, there is trouble between Bella and Will, when they struggle to find things in common. 77 "A Date with Destiny" Colin Budds Chris Roache 16 April 2010 (UK) 325 The girls find a way to simulate a full moon, so that they can finish watching the message the Moon Pool was trying to show them. They discover that the comet they saw is being drawn towards the Earth by the Moon Pool's magnetic pull, and is going to hit Mako Island. The girls must try to harness the power of Mako Island's magnetic crystals to force the comet away, and save the Earth. Meanwhile, the cafe is in danger of going bankrupt, and Sophie is searching for ways to earn more money. She gets her chance when Ryan (who is annoyed that Sam has ended his research on Mako Island), spots the crystal in Bella's necklace, and tells her that it might be valuable. After finding out where Will got the crystal from, Sophie leads Ryan to Mako Island (with a reluctant Zane close behind), and they discover the magnetic crystals in the walls of the Moon Pool cave. 78 "Graduation" Colin Budds Joss King 16 April 2010 (UK) 326 By harvesting the magnetic crystals, Zane, Sophie and Ryan have severely damaged the Moon Pool, and the girls find that it no longer has enough power to push the incoming comet away from the Earth. All seems lost, but Bella, Cleo and Rikki band together, and use their own magic to create a tower of water and light, that knocks the comet off course, making it miss the Earth. With the Earth saved, the girls then graduate from school, and celebrate in the cafe, but there is one more surprise in store for them... Lewis has returned home.

Guest starring: Angus McLaren as Lewis McCartney