Infinity Train

Plot
The series is set on a seemingly endless train traveling through a barren landscape; the cars of the train contain a variety of bizarre and fantastical environments. The passengers on the train are people it picks up who have unresolved emotional issues or trauma. As they travel through the train's cars, their adventures inside them give them the opportunity to confront and resolve their emotional problems, represented by a glowing number on their hand that goes down as they confront these issues. Once they resolve their issues and their number reaches zero, a portal opens and they are able to leave the train and return home.

The first season focuses on Tulip Olsen, a girl struggling with her parents' recent divorce. She is accompanied by a small, confused robot named "One-One", and Atticus, the ruler of a kingdom of talking corgis. She eventually uncovers many of the train's secrets and confronts Amelia, a passenger who, instead of resolving her trauma from her husband's death, has usurped the role of Conductor from One-One and tried to take control of the train. Before leaving the train, Tulip persuades Amelia to try to adapt to the changes in her life.

In one first-season episode, Tulip frees her own reflection from the mirror world, and the two part ways. The second season focuses on the emancipated Mirror Tulip ("MT"), now on the run from enforcers attempting to execute her as punishment for abandoning her role as Tulip's reflection. She teams up with Jesse, a new train passenger, as well as Alan Dracula, a silent deer with a variety of powers. She helps Jesse leave the train by helping him learn to stand up for himself, and he returns to the train to help her escape to the outside world, as well.

The third season centers on Grace and Simon, the leaders of a cult of rogue passengers who vandalize the train and assault its denizens to keep their numbers high. Their travels with a young girl named Hazel and her gorilla friend, Tuba, make Grace more sympathetic to the train's denizens. After Simon kills Tuba, it is revealed that Hazel herself is one of Amelia's creations, and Grace realizes what she thought she knew about the train is wrong. After fighting off Simon's attempt to usurp control, Grace begins facing up to and mending her mistakes.

Set decades earlier, during the period while Amelia is establishing control over the train, the fourth season centers on Ryan and Min-Gi, two best friends who want to become famous musicians. Their relationship is strained due to Ryan's brashness and Min-Gi's fear of the future. While on the train, they meet a talking service bell named Kez who has trouble owning up to her mistakes. Ryan and Min-Gi come to realize that they need each other in order for them to move forward in life, while Kez finally apologizes to other train denizens she harmed.