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Infinity Train is an animated Science Fiction anthology series created by Regular Show storyboard artist Owen Dennis and produced by Cartoon Network Studios. Each season revolves around events on a mysterious, seemingly endless train in the middle of a vast wasteland on which troubled individuals suddenly awaken to find themselves as reluctant passengers. Now sporting a strange glowing number on their hand, these people have no choice but to make their way through the worlds and puzzles presented by each car in order to find a way home.

  • Book One follows the exploits of a teenage girl named Tulip (Ashley Johnson), who finds herself on the train after running away from home. On her journey to confront the conductor for a way off the train, she is accompanied by a Literal Split Personality Robot Buddy named One-One (Jeremy Crutchley and Owen Dennis) and a talking corgi named Atticus (Ernie Hudson). It ran from August 5 to August 9, 2019. (Trailer 1, Trailer 2, Trailer 3)
    • The Train Documentaries: A series of shorts starring One-One as they visit different cars on the train in order to create informational videos for future passengers. It aired from October 19 to November 16, 2019.
  • Book Two follows MT, the renegade Mirror Self of a previous rider, who is evading a pair of reflection officers (Ben Mendelsohn and Bradley Whitford) who wish to capture and execute her. After her most recent close call, she finds companionship in a new passenger, a teenage boy named Jesse (Robbie Daymond), and a mysterious deer-like entity named Alan Dracula. It ran from January 6 to January 10, 2020. (Trailer)
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  • Book Three follows Grace (Kirby Howell-Baptiste) and Simon (Kyle McCarley), the leaders of a group of child passengers who get separated from them after a mission gone wrong. While working to get back, they find their ideologies challenged when they encounter Hazel (Isabella Abiera), a young passenger with a broken number, and her gorilla companion Tuba (Diane Delana). It ran from August 13 to August 27, 2020. (Trailer)

The original pilot was released on November 2, 2016 as a "Cartoon Network Minisode". The short, which can be viewed here, received over a million views within a month and remains the most popular original short on the company's YouTube page. On March 2, 2018, a teaser site opened, revealing that a full-length series had been greenlit for a 2019 premiere; the teaser can be viewed here. The first two seasons aired on Cartoon Network, with the show being rebranded as a HBO Max original series starting with its third season.

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    General 
  • Adult Fear: Since passengers are gone for real time, every passenger is a case of this, being individuals who have inexplicably disappeared from the surface of the Earth with no possible way to trace or make contact with them. Especially distressing since while some stays are relatively short (Jesse is gone for "only" a few weeks), others are stuck there for much longer before leaving (Tulip was gone for at least five months). And then there's the ones who remain on the train for several years, with their families and loved ones likely giving up hope of ever seeing them again.
  • Aerith and Bob: The character names range from relatively normal (Nancy, Randall, Kate, Mikayla, Andy, Megan, Jesse, Amelia) to somewhat unusual but still plausible (Tulip, Atticus, MT, Alrick) to practically made up (One-One).
  • Alice Allusion: Several. Not surprising, given the premise. In fact, you could argue that the entire show is an Alice Allusion. A blink-and-you'll-miss-it moment in "The Past Car" even shows a snippet of a character's essay on Alice in Wonderland.
  • All There in the Script: The names of some creatures and beings are never stated in the show, and can only be gleaned from the credits sequence unless a return appearance has that information vocalized. For example, no character refers to the soul-sucking cockroach dogs by their name of "Ghoms" until Book 3.
  • Animated Tattoo: Each passenger is given a glowing tattoo with a number on it that changes based on their behaviour.
  • Another Dimension: Wherever the train is, it has soul-sucking creatures that live in the desolate wasteland surrounding it, and there's a swirling vortex in the sky that occasionally absorbs passengers who recently hit their number to zero, so they can come off the train and return home.
  • Bigger on the Inside: Most of the cars are notably bigger on the inside than their already impressive external dimensions would imply, including cases where there's space behind the doors. In the pre-Book 2 videos, One-One describes each car as its own "pocket universe".
  • Bilingual Animal: The series has multiple examples. Most prominently Atticus in Book 1, a dog who can speak eloquent human language, but also sings a ballad in one episode that consists entirely of howling.
  • Blue-and-Orange Morality: The train desires its chosen passengers to become emotionally mature, which isn't bad in and of itself. The problem comes in everything else. The obvious complications of pulling people out of their lives without warning or consent are ignored. People who are not ready to move on are disproportionately punished with ridiculously long sentences, while those who cause trouble or don't care about going home are essentially rewarded with the extended stay they desire. The train will abduct you for reasons as broad as "attempted suicide after the death of a loved one" to "still sad about a dead childhood pet", and kidnaps anyone from children to the elderly. A passenger can be dropped off in a train section that doesn't have food or water for miles, or find themselves wandering into a train car host to ridiculously dangerous obstacles that are just as likely to kill the passengers as they are to help them grow as people. And that's all without getting into the fact that even with recently-introduced benefit of One-One's videos, passengers receive no information on why they were taken, and thus have no idea how they're meant to meet the conditions for leaving. Amelia even states in Season 3 that One-One only cares about the passengers insofar as they are numbers on a screen, and has no personal investment in their progress.
  • Bootstrapped Theme: While each season has its own theme music, "Running Away" is considered the de facto theme of the entire series.
  • Central Theme: How to confront trauma and other psychological issues, as well as the consequences for not dealing with such properly.
  • Character Development: Practically an Enforced Trope by the titular setting for passengers who wish to leave the train. The only way to leave the train is to reduce your number to 0, which can only be done by emotionally progressing into a better person.
  • Civilized Animal: Several, from entire communities of corgis and turtles, to individual creatures such as The Cat and Tuba.
  • Coming-of-Age Story: In many ways, the show acts as a Deconstruction of adventure stories where kids travel to a magical world and overcome their problems, ala Labyrinth or The Pagemaster. The train defies the Year Inside, Hour Outside and All Just a Dream tropes that usually accompany these stories, the magical and quirky companions that become loyal friends to our heroes are created solely to be avenues for their character development, regardless of the lives they live outside of that, and refusing to accept any sort of growth means you're trapped for years, maybe even decades, until you do.
  • Cool Train: Once you get past the nightmarish thought that you may never leave, the train grants you the opportunity to visit an infinite number of amazing pocket universes, including one populated entirely by talking corgis.
  • Dark Is Not Evil: The train itself, despite its eldritch and deadly nature, only brings people aboard as a method to help them confront their psychological issues.
  • Death World: The train is surrounded by barren wastes stretching out to the horizon, which is populated by creatures like the cockroach-dog Ghoms that drain the life energy from their victims, and a vortex in the sky that occasionally shoots down a beams of energy that absorb passengers. While the cockroach-dogs are definitely a health hazard, the vortex is actually a bait-and-switch, as it takes you back home. It is then revealed in "The Tape Car" that the death world may just be another part of the train.
  • Down the Rabbit Hole: Some of the trappings are different, but the gist is still that passengers enter a strange land filled with strange inhabitants and must learn about themselves before being allowed to go home.
  • Eldritch Location: The train seemingly has no end, possesses creatures which defy logic, and the cars themselves have properties which don't fit their external design. The area around the train isn't much better. It's also implied on some level to be sapient with a will of its own separate from its conductor's, with Amelia being unable to recreate her old life no matter how many times she tried. The only normal thing about it is that, like all trains, it at least has an engine.
  • Epiphanic Prison: The train. Its "victims" are those who are going through some problem, and the only way to escape is to gradually understand and work through it.
  • Extremely Short Intro Sequence: A six-second intro that consists an ominous synth, followed by the show's Recurring Riff and the sound of a passing train. The train sound may or may not bleed into the start of the episode proper depending on if the characters are entering/exiting a train car or not.
  • False Camera Effects: The show utilizes slight film grain and distortion effects to replicate the feeling of watching an older television show. A handful of episodes also make use of Rack Focus.
  • Genius Loci:
    • It's somewhat implied that the train itself has a will and intention of its own. Even with Amelia usurping One-One as Conductor, the train continues to do the exact same thing it was already doing when she took over despite her being singularly focused on recreating her old life. Furthermore, no matter what Amelia does, after years of trying, she can't recreate her fiancé and the train keeps putting her number up higher and higher in response to her falling further and further into her demons. One-One also explicitly refers to the train as his mother.
    • In Book 2, the train is shown to be able to seemingly exert a force upon M.T., Alan Dracula, and Mace that makes it physically impossible to move too far from the train itself, with Mace even saying that the train is doing it.
  • Hard Light: The environments of the cars are solid holograms, generated by orbs that are usually hidden by the scenery.
  • The Homeward Journey: The goal of most passengers is to escape the train and return home.
  • Hybrid Monster: The Ghoms have the physical features of wolves and cockroaches.
  • In Medias Res: When episodes aren't an immediate sequel, they're this trope, beginning with the characters exiting one of the many train cars explored during the interim and briefly alluding to the adventure they had there.
  • Idiosyncratic Episode Naming: Every episode follows "The (noun) Car" format, relating to whatever car (dimension) on the train is visited. Each season does have an exception, such as Book 2's "The Wasteland", but they still relate to something regarding the train.
  • In-Universe Catharsis: Ultimately, it seems this is the purpose of the train: to force people to confront their pent up trauma and negative emotions and finally move on. The only way to escape is to finally do so, the number of issues that they still have to deal with represented by a literal glowing green number on their hand, which opens a door to the home of the passenger when it reaches 0.
  • Late-Arrival Spoiler: The train's purpose is implied in Book 1, and outright stated at the start of Book 2, to be the above-mentioned In-Universe Catharsis. The train appears to individuals who are experiencing severe emotional or psychological distress at a pivotal moment in their lives, with the journey through the cars meant to facilitate mental healing, growth, and change in an extreme version of adventure therapy.
  • Logo Joke: The Cartoon Network Studios logo opens up to a POV shot of that season's core protagonist staring at their hand, with something changing about the situation as the season goes on. Books 1 and 2 only change them for the finale, while Book 3 changes them for every episode.
  • Loyal Animal Companion: Each Book has one of these towards at least one of the other main characters:
    • Book 1: Atticus the male Corgi dog towards Tulip.
    • Book 2: Alan Dracula the male deer towards both MT and Jesse.
    • Book 3: Tuba the female gorilla towards Hazel. After a little while, this starts to extend to Grace and Simon as well, until Simon brutally murders her.
  • Magitek: What the train is. The train, while being incredibly technologically advanced, houses some supernatural elements such as the Chrome Car, which is a car that seemingly brings reflections to life.
  • Mechanical Abomination: The train itself. It's an infinite train with cars the size of buildings running through another dimension, those cars are their own pocket universes, and it has some serious Blue-and-Orange Morality regarding getting over trauma. While we do eventually learn a little bit about how it functions, where it came from is completely unknown; it just is.
  • My Instincts Are Showing: Many of the talking animal denizens are like this. Atticus is the eloquent leader of a nation, but he's also still a dog who loves getting his tummy rubbed and chasing balls. Likewise, The Cat is a long-lived trickster who still can't help but hiss and scratch things when upset.
  • New Weird: An interdimensional train that kidnaps people and forces them to run a gauntlet of random and bizarre pocket dimensions until they work through their emotional trauma, is piloted by an AI with a Literal Split Personality, continuously builds new cars for itself, and is inhabited by everything from talking corgis and sentient blobs of water to mirror policemen and human-sized pencils with limbs.
  • Next Sunday A.D.:
    • Book 1 canonically has Tulip board the train on November 22, 2019 and return home sometime in early Spring, while the series itself premiered August 2019.
    • Book 2 takes place in early Summer 2020, while the season aired in January 2020.
    • Averted with Book 3, which both takes place and aired during Summer 2020.
  • Perpetual Motion Machine: The train only stops when passengers zero out and is in the middle of a barren wasteland, yet it's apparently been running for centuries and continually expands upon itself, growing ever longer as it produces new cars, with no apparent means of gathering resources.
  • Power Trio:
    • Books 1 and 2 utilize this setup, starring a human passenger (Tulip and Jesse), a non-human entity who serves as a guide (One-One and Mirror Tulip (MT)), and an additional Loyal Animal Companion created by the train (Atticus and Alan Dracula).
    • Averted in Book 3, which has a Four-Philosophy Ensemble of three human passengers (Grace, Simon, and Hazel) and an animal companion (Tuba) instead. Tuba then dies halfway through the season and gets replaced by a fourth human passenger, Amelia. Hazel is also revealed to not be human at all, meaning that the setup was actually two humans and two denizens, followed by three humans and one denizen.
  • Reality Warper: The train is able to appear anywhere in the real world it needs to, generating the necessary space and train tracks to drive there, and even taking whatever form would best entice its target to inspect it. This ranges from appearing on top of a university building roof as a futuristic train to showing up inside a police station with its cars stylized as royal carriages.
  • Recurring Riff: The musical riff heard in the opening sequence (high D, B, high G, F#) plays repeatedly throughout the series, both in the rest of the soundtrack (specifically within the main theme tunes of each season) and in-universe as a method to control various mechanisms on the titular train.
  • Rotating Protagonist: Each season/book focuses on supporting characters that had been introduced the previous story arc.
    • Book 2 focuses on Mirror Tulip, first met in Book 1's "The Chrome Car.
    • Book 3 focuses on Grace and Simon, who were named in Book 2's "The Lucky Cat Car" and "The Mall Car" (respectively), after appearing in a Freeze-Frame Bonus in Book 1's "The Engine".
  • Riddle for the Ages: While we learn the purpose of the train and even discover its inner mechanisms over the course of the series, who or what is responsible for the train's existence to begin with is never revealed.
  • Talking Animal: Quite a few examples, but most prominently Atticus, Tuba (the Loyal Animal Companions of Books 1 and 3, respectively), and The Cat. This is averted, however, by Alan Dracula, the animal companion of Book 2, who does not speak.
  • Unishment: The train has no punishment for its passengers acting rowdy. Whether they refuse to learn their lessons or are just outright malicious to the denizens or even other passengers, their only "punishment" is their number going up, which has no physical effects. In fact, some passengers actually quite desire being on the train as opposed to going home to the lives that made them miserable in the first place.
  • Vampiric Draining: The Ghoms are robotic cockroach-dog creatures that can suck out the life force of passengers, and presumably other denizens, with their mouths.
  • Year Inside, Hour Outside: Discussed and subverted. Tulip mentions in "The Chrome Car" that she's been on the train for quite a while, but isn't sure what that means for the outside world. We later learn that time on the train and time back on Earth advance at the same rate, with it explicitly told and shown that Amelia arrived as a young adult in the mid-1980s and is now a middle-aged woman.

    Book 1: The Perennial Child 
  • An Aesop:
    • Things in our lives change and often those changes are simply beyond your control. Treating those things like they are your responsibility and trying to fix them will cause needless stress and only lead to more problems. The only solution is to try to adapt to life's changes.
    • Failing to properly process trauma and the negative emotions associated with it will only cause you to fall further and further into them, and trying to live in the past before it happened will do nothing but make things worse. The only way to recover is to process your trauma and move on.
  • Ambiguously Evil: The Steward is heavily armed and attacks without provocation, but it doesn't try to kill Tulip intentionally, only demanding she returns to her seat. It also flees at the sight of One-One. It turns out to work for the Conductor as The Dragon.
  • Arbitrary Skepticism: Tulip constantly questions the logic (or, rather, the lack thereof) of the train, despite having traveled through dozens of different worlds by the third episode, wondering why arbitrary actions like singing would have any effect on their progress.
  • Bait-and-Switch:
    • Tulip sees someone being sucked up into a vortex in the first episode and thinks it's a bad thing. It's actually a good thing, as it takes you home once you confront your traumas.
    • When she asks One-One about the significance of the number decreasing, he states that if it reaches zero, then she's gone forever... from the train, because it's not counting down how long she has to live but how much trauma she's currently going through.
    • A meta one appears at the end, as audiences were made to believe the show was a ten-episode miniseries until a "Will Return" Caption stated otherwise.
  • Big Bad: The Conductor, Amelia. When she catches up with Tulip in the Ball Pit car, she indicates that everything is supposed to exist as she intended, and Tulip's pursuit of freedom by moving through the cars throws everything into chaos.
  • Big Shadow, Little Creature: The giant monster that was scaring Atticus and his subjects turn out to be just a tiny spider, projecting a huge shadow with the help of a glowing orb.
  • Bittersweet Ending: Tulip manages to return home and mends her relationship with her parents. However, Amelia will likely be trapped on the train for the rest of her life, it's unlikely Tulip will ever see One-One or Atticus again, and the "no reflection" thing is bound to cause problems.
  • Book Ends: The season begins and ends with Tulip heading off to Coding Camp.
  • Captain Obvious: Upon seeing the exterior of the train and a passenger getting vaporized, Tulip asks One-One what happened, with his reply being that she's in a bad place at the moment. Played with, as the "bad place" is Tulip's obviously troubled state of mind, not her physical location; it's later shown that the "vaporization" was the passenger lowering his number to zero and escaping the train.
  • Chekhov's Gag: The first thing One-One does when he meets Tulip is ask if she's his mother. It goes on to be a running gag for the season, and it turns out that the mother he was looking for was the motherboard of the train, because he's the real Conductor.
  • The Comically Serious:
    • Sad-One speaks in a monotone and often is The Eeyore. He also has some of the funniest one-liners.
    • To a lesser extent, Atticus. He's a regal, dignified king who also happens to be an adorable corgi and treats simple dog things with the utmost seriousness.
  • Dark Is Not Evil:
    • Alrick; while he was shown wearing the black hoodie the Conductor is known to wear, he was a sweet man. His wife, on the other hand...
    • One of the first unsettling sights that Tulip sees in the train dimension is a swirling vortex that absorbed a fellow passenger, making Tulip realize that she could possibly die on the train. The penultimate episode reveals that the vortex is a good thing, as it means you zeroed out your number and can finally return home.
  • The Dragon: The Steward, to the Conductor.
  • Eureka Moment: Tulip briefly loses hope when the monster in the Corgi Car turns out to be a spider's shadow cast by a glowing orb, but after Atticus calms her down, she questions how a normal spider would even affect the water level, leading her to the Steward.
  • Everything's Better with Dinosaurs: One of the train cars is full of baseball-playing dinosaurs, as seen in "The Cat's Car".
  • Evolving Credits: In the vanity plate, Tulip stares at her hand as it quickly rotates through the numbers. The final end card has the number stop at zero, then fill the screen with a blinding light, returning her home.
  • Exact Words: When Tulip asks the significance of the number, One-One states that if it hits zero, she's "gone forever", making Tulip think she's going to die. He meant gone forever from the train. He never said she was going to die. On a slightly lesser note, when Tulip asked One-One in the previous episode what happened to the vaporized passenger, his reply is that she's "in a bad place right now." He meant her mental state, not her physical location. Her mental state, of course, being an important factor in getting off the train.
  • Fake King: The Conductor is actually train passenger Amelia, who overthrew the true Conductor, One-One, to try and make a car with a replication of her dead fiancé.
  • Finish Dialogue in Unison: When Atticus attempts to explain the monster.
    Atticus: I will admit, there are some things I haven't told you about Corginia–
    Atticus and Tulip: Like why there's a giant shadow monster!
    Atticus: Yes. Patience, young lady.
  • Fireball Eyeballs: The Steward has blue flames coming out of its eye sockets that are generated by a pair of valves behind its mask.
  • Five Stages of Grief:
    • In a rare example where death isn't the cause, Tulip is stuck in Denial over her parents' divorce, trying to ignore everything to avoid facing the pain, occasionally slipping into Anger. By the end, she's moved on to Acceptance.
    • Amelia was originally in Depression following her fiancé's death, but by the present is stuck in Bargaining and Anger, and due to her power over the train as Conductor, is extremely dangerous because of it. Thanks to Tulip, she's at least starting down the path to Acceptance.
  • Foreshadowing:
    • There are a few hints at One-One being the real Conductor, like his obsession with "fixing" the Unfinished Car, the Conductor/Amelia's obsession with capturing him, and how he was able to take control of Amelia's tape.
      • The fact that it's One-One that tells Tulip about the significance of the number. As Tulip stated, he made her think that she was going to die.
      • During the first encounter with the Steward in "The Corgi Car", it flees upon seeing One-One. It used to work for him until Amelia took over.
    • Tulip sarcastically mentions how her number is going down because she's "growing as a person" in "The Cat's Car". She's absolutely correct.
    • When Tulip comes dangerously close to crossing the Despair Event Horizon at the start of "The Past Car", her number starts to go back up because she's slipping back into the habits that led to her being unable to deal with her trauma. This turns out to be foreshadowing for "The Engine", where it's revealed that Amelia's own number has been increasing the whole time she was acting as the Conductor, and it's now so long it extends off her arm and onto her neck.
  • Freeze-Frame Bonus:
    • When Tulip wakes up in "The Grid Car", for a split second you can see one of the mechanical pods which deposit new passengers flying behind some trees in the background.
    • During the first half of "The Ball Pit Car", for just a few frames you can see the shadow of the stewardess swoop by in the background after Tulip drags the other three up the rolling ladder. Her shadow appears again later in the episode in a porthole window off to the side.
    • In the final moments of the show, Tulip still doesn't have a reflection in the mirror.
  • Funny Animal: The turtle people in "The Unfinished Car", though curiously they're led by a quadripedal tortoise.
  • Hard Truth Aesop: Tulip and Amelia both get a reality check about their problems: trying to pretend they don't exist or desperately undoing the past is impossible. Thanks to her parents' divorce, Tulip has become sullen and bitter towards them, believing everything was perfect and they ruined her life. She's forced to realize that, actually, the red flags were there the whole time and her parents are flawed but not malicious. Meanwhile, Amelia eventually realizes she can't bring her husband back, no matter what she does, and breaks down in Tears of Remorse over what she did.
  • Furry Reminder: Both Mulgrowl the Cat and the corgis of the corgi car are intelligent and capable of human speech, but still act like their respective species and point out traits like their lack of thumbs when asked why they're incapable of certain tasks.
  • Light Is Not Good: All of the main villains are associated with the color white, with the Steward even having blue fire.
  • Lightmare Fuel: The entire series provides examples of this, but pride of place should be given to giant, soul-sucking dog cockroaches playing musical notes and making coloured blocks as they are thrown across the Grid Car.
  • Literal Split Personality: One-One is a ball-robot with two personalities: Glad-One, the eternal optimist; and Sad-One, the eternal pessimist. The two personalities can split down the middle to function independently.
  • Living MacGuffin: The reason why the Conductor/Amelia seeks to reclaim One-One is because he is a key component to stopping the train itself. One-One is the real conductor, and Amelia wanted to make sure he never had a chance to reclaim control of the train.
  • Living Shadow: Subverted. The corgis fear the shadow monster that raised the tides, but the beast is actually just a spider whose shadow was being cast by a light; the actual cause of the problem is a tentacled robot.
  • Lotus-Eater Machine: Tulip's videotape full of false but happy memories was intended to be a gift to bring her everlasting happiness, with other such tapes existing. The train itself is arguably one for its native inhabitants as well, with every car serving its purpose with the intent of keeping its denizens placated. "The Engine" reveals dozens of passengers exist on the train simultaneously, but the infinite nature of the train means Tulip never met them.
  • Mathematician's Answer:
    Tulip: How does this door work? Are you like a real robot? Are there other people on here? Is this what trains are like?
    Glad-One: Yes!
    Tulip: Yes to what? Which?
    Glad-One: I dunno.
  • Metaphorically True: When Tulip asks what the number means on her hand, One-One states that she'll be gone forever if it goes down to zero. In the sense that the old self filled with trauma will be gone forever and she'll be reborn as a new person.
    • It can also be interpreted to mean that Tulip would leave the train and never come back.
  • Mood Whiplash: "The Ball Pit Car" starts off mostly lighthearted as Tulip, One-One, and Atticus play around through a ball pit funhouse, and then the Conductor shows up...
  • Mundane Solution: Some of the more benign inhabitants of the train, such as One-One or Atticus, have no idea how to exit their respective cars due to... their inability to reach or turn the door handle.
    Tulip: ...That's how all doors open!
    Atticus: [mildly offended] My people have been working on this technology for decades.
  • New Content Countdown Clock: The U.S. television premieres had the episodes of The Amazing World of Gumball which preceded them feature these.
  • Not So Different: After watching Amelia's tape, Tulip is at first angry because she didn't want to feel bad for her, preferring to think of The Conductor as "some heartless robot thing", but now she realizes that Amelia is having her own trouble adapting to the changes in her life, running away out of fear just like Tulip herself. It's this realization that ultimately brings Tulip's number all the way down to 0 and opens her exit car containing the portal that will take her back home.
  • Ontological Mystery: Tulip is stuck on the train with no idea what it is or how to leave. She also has a glowing number stuck on the palm of her hand that has no immediately discernible meaning. The number turns out to be representative of the issues that Tulip is refusing to deal with, and once she manages to overcome them, the number reaches zero and a door home opens.
  • Parental Issues: It's clear in the first episode that Tulip is not taking her parents being divorced well.
  • Pensieve Flashback: How the passengers' memory tapes work when watched.
  • Rewatch Bonus: A good chunk of One-One's more non-sequitur dialogue has Double Meanings that, upon rewatching, reveals itself to have been foreshadowing and/or straightforward explanations of various elements of the train when placed in the proper context.
  • Ridiculously Cute Critter: Corginia is a kingdom full of sentient corgis that like to lie in the sun and have their belly rubbed. The sole "ugly" inhabitant isn't even ugly; he's only referred to as such because he's a different breed of dog.
  • Robot Buddy: One-One is Tulip's ditzy robot sidekick.
  • Royals Who Actually Do Something: Atticus personally joins Tulip to defeat the monster and braves the Steward's machine-gun fire in a valiant, but ultimately futile, attempt to attack it. Once the Steward escapes, he joins Tulip's journey to the train's engine so that he can assure that it will never do damage to his kingdom again.
  • The Runaway: After a scheduling error kept either of her parents from taking her to a video game design camp like they had promised, Tulip decides to try and head there by herself, which is how she finds the train.
  • Samus Is a Girl: In "The Past Car", the Conductor is unmasked as Amelia, who deposed the original conductor One-One.
  • Soundtrack Dissonance: While Tulip is running from the Ghoms, One-One suddenly starts humming "Yakety Sax".
    Tulip: What are you singing!?
    One-One: It's a wacky getting chased song. I made it up.
  • Stealth Pun: Tulip's dad affectionately calls her "bud". As in a tulip bud. It could even be considered a Multiple Reference Pun, as it echoes the expression "budding genius".
  • Surprise Creepy: The idea of being stuck on a train with no way out is a little unnerving, but helped by some of the whimsical characters and locations that Tulip interacts with. Tulip herself is actually enthused about the whole situation until she realizes she isn't on Earth anymore and surrounded by life-threatening creatures both inside and outside the locomotive.
  • There Is Another: It's nonchalantly revealed that Tulip isn't the only passenger in "The Cat's Car". It turns out the Conductor is one of them.
  • Those Two Guys: One-One and Atticus sometimes act this way when the focus is just on Tulip.
  • Token Black Friend: We only see Mikayla in the first episode, helping to serve as exposition for Tulip's intentions. She also happens to be black.
  • Trademark Favorite Food: Tulip is repeatedly seen eating raw onions, and one of her altered memories in "The Cat's Car" shows her mom presenting her with double onion ice cream cake. She even has an onion-shaped eraser on the end of her pencil.
  • Tragic Villain: Amelia lost her fiancé and found herself onboard the train. She became the Conductor and tried to create a perfect world where he was still alive and they could live happily. Her sadism appears to simply be one way she fills the void he left in her.
  • Wham Episode:
  • Wham Shot:
    • "The Past Car" has Tulip see the memories of the Conductor, with someone wearing a black hoodie entering the train. Much to her surprise, it's not Alrick — who was shown wearing a black hoodie and speaking with a robotic voice similar to that of the Conductor — but his wife, Amelia.
    • How big of a number does Amelia have? It's gone past her arm and up to her neck.
  • "Will Return" Caption: The original television airing of "The Engine" had a short promo clip air before the credits sequence, telling the audience this.
    One-One: Back as Conductor and better than ever! See you next time!
    Infinity Train Will Return
  • You Need a Breath Mint: Tulip's habit of snacking on raw onions earns her this remark from her friend Mikayla.
  • Your Days Are Numbered: Subverted. After a comment from One-One, Tulip becomes convinced that the numbers on her hand are counting down to her death. When she tells this to The Cat as part of her plea for help, the feline points out that One-One isn't the smartest or most optimistic being out there. It turns out that the number actually indicates the weight of your emotional trauma. However, Amelia notes that the number can also go up...
    Tulip: One-One! You made me think I was gonna die!
    Sad-One: It'd be surprising if you never died.

    Book 2: Cracked Reflection 
  • And Then What?: Discussed in "The Wasteland", when Mace points out that even if MT successfully escaped the train, her metal skin means that she'd be unable to have a normal life alongside Jesse in the real world. MT is unable to muster up a counterargument but insists she'd figure something out.
  • Big Bad Duumvirate: Special Agent Mace and Agent Sieve, who were Villains of the Week in Book 1, ascend to main villain status, where they relentlessly hunt Mirror Tulip as she attempts to escape the train.
  • Body Motifs: Throughout the season, MT repeatedly looks down at her reflection in her hand for self-examination and contemplation. Plus it's the only way she can look at herself without risk of summoning the Flecs.
  • Bowdlerise: The scene in "The Wasteland" where MT kills Mace by grinding him against the train wheels was cut out of Latin American airings.
  • Bread, Eggs, Milk, Squick: One-One explaining to MT the process of waking up a passenger.
    One-One: It involves robots and coding and juice boxes and...
  • Break Them by Talking: In "The Wasteland", Mace does this throughout the entire episode to MT. From drilling her on how she plans to live a normal life when she isn't actually human, to claiming that she's just traded in being a literal reflection to being a metaphorical one for Jesse and other passengers. But rather than demoralize her, it ends up giving her another idea to try out.
  • Brick Joke: In "The Black Market Car", MT sees a new passengers that appears to be a lunch lady. In "The Map Car", Jesse describes an old lunch lady he knew and muses about her possibly being a passenger as well.
  • Call-Back: Most of the denizens and carnival games seen in "The Lucky Cat Car" serve as this for Book 1 and "The Train Documentaries".
  • Central Theme:
    • Independence. MT is trying to rebel against the Mirror World's corrupt and totalitarian views, wishing to be her own person instead of being forced to become something she's not or being killed. Jesse also has to learn that not being able to please everyone is okay, since he was an Extreme Doormat who allowed his "friends" to take advantage of him and hurt his little brother.
    • Identity. Much of the season also surrounds MT trying to define herself as her own person separate from Tulip or anyone else, not only rejecting the myriad of labels everyone else tries to give her, but also trying to establish that she has actual worth as a living being when both the Mirror World and the train insist that she doesn't.
  • Chekhov's Skill: Alan Dracula's Eye Beams and constant craving for grass end up helping MT and Jesse escape from the Flects one final time as they attempt to take the exit to Jesse's home. When Sieve grabs MT by the ankle right as she's halfway through the door, she grabs some grass from the ground and throws it back through the portal to get Alan Dracula's attention. He then uses his eye beams to finish off Sieve.
  • Contrasting Sequel Antagonist: The Mirror Police's tenure as main villains is much different from the Conductor's. The Conductor was shrouded in mystery, only interacting directly with the protagonists towards the end; their goals and intentions were obtuse for the longest time and Tulip only represented a minor setback towards them; their actions effected the entire train and they answer to no one but themselves. In stark contrast, Mace and Sieve are recurring threats from the first episode of the season, their intentions are immediately clear with capturing MT being their explicit goal, they do their best to minimize interactions with other inhabitants and passengers whenever possible, and they're working on behalf of a greater organization.
  • Continuity Nod: The various cars that appear in photos that Jesse has taken during his stay are ones that appeared in the "The Train Documentaries" shorts that aired between Books 1 and 2, such as the Cross-Eyed Ducks Car and the Green Car.
  • Cult of Personality: The Apex have sort of formed one for the previous Conductor, seeing One-One as a usurper. Instead of trying to fix their problems, they make their numbers go up by causing mischief on the various train cars. They also have a sound wave marked across the middle of their face, denoting the analogue hijacking noise she used to control the Steward.
  • Double-Meaning Title: The name ‘Cracked Reflection’ applies to both MT and Jesse. MT is essentially "cracked" because she took a third option, breaking the rules of the Mirror World to enter the real world. Meanwhile, Jesse is figuratively a "cracked mirror" as he's a people pleaser who copies even the awful behaviors of his peers in order to better fit in and be more likeable.
  • Earn Your Happy Ending: It takes a lot of work, and they go through a lot to do it, but MT manages to escape from the train and is now free to be with Jesse in the real world without the threat of the Mirror Police showing up whenever she reflects in something.
  • Evolving Credits: In the vanity plate during the end credits, MT stares at her hand, with her downtrodden frown reflected back at her. The final end card has her give a relieved smile, her surroundings no longer that of the train but of the meadow by Jesse's home.
  • Family-Unfriendly Death: Both Mace and Sieve suffer from this, the former grinded into the wheel of the train and the latter hit by laser beams and exploding.
  • Foreshadowing: MT often looks at herself in her hand when thinking. In "The Number Car", her reflective hand lets her use Jesse's number as her own to escape the train.
  • Getting Crap Past the Radar: In "The Wasteland", MT spends most of the episode dragging around Mace, who suffers the mirror person equivalent of getting chopped in half, gore spilling out and everything, and still being alive. And she finishes the job at the end of the episode when he tries to take her with him by grinding him to a mess against one of the train's wheels, with some of his fluids splattering on her unshaken face. Overall, it looks like the only way the writers got away with this is because Mace isn't human.
  • Internal Deconstruction: Much of Book 2 examines exactly how the mechanisms of the trains work from the perspective of the denizens. The train’s occupants each live rich and elaborate lives, but as far as the train itself is concerned, they exist entirely to help passengers. They either bond deeply with new friends only to lose them or experience extreme brutality at human hands.
  • Logic Bomb: Being forced to leave M.T. when she couldn't follow him through his door was so emotionally traumatizing to Jesse that he actually ended up back on the train. Because his problem is leaving M.T. behind, who can't have the number that she needs to leave because she's a denizen of the train, his new number can't even settle on a rational number instead of things like a square root or pi. Trying to figure out the issue drives One-One into such a loop that it even physically affects the train. Jesse even restarts the recursive loop when the One-One starts to agree with a suggestion that killing M.T. would resolve the issue.
  • Loophole Abuse: M.T. manages to get a number by holding Jesse's hand in such a way that his number reflects into her hand. Since it solves the aforementioned Logic Bomb, One-One allows it.
  • Magical Security Cam: The Mirror Agents can locate MT when she passes by any reflective surface, so she carries a can of black spray paint in order to coat all such surfaces to prevent this from happening. Her own surface is the only exception to this.
  • Meaningful Rename: MT chooses to rename herself "Lake" after getting off the train, referencing the fact that she can now enjoy the sight of a lake and any other reflective surface without worry. Doubles as a Line-of-Sight Name, as she chooses the name after staring into a nearby one.
  • Mini-Mecha: The Steward returns near the end of the season, filling this function for One-One.
  • New Content Countdown Clock: Like with the first season, the U.S. television premieres had the episodes of The Amazing World of Gumball which preceded them feature these.
  • Reality Ensues:
    • MT and Jesse form a strong friendship over the season, each learning to accept the other's flaws and help them deal with it. He even promises to help her leave the train when he does. When Jesse zeroes out and is forced to leave the train in "The Mall Car", he's traumatized over being unable to keep his promise and leaving her at the mercy of the Mirror Police. So traumatized, in fact, that the train picks him up again.
  • Ship Tease: Subverted, as the writers intended Jesse and MT to be platonic. This doesn't stop the audience from viewing the constant hand-holding and blushing, Agent Mace mockingly calling Jesse MT's boyfriend, and Jesse having to come back to the train because he was so torn up about leaving MT behind as signs of romantic interest.
  • Shoo Out the Clowns: Once Jesse leaves the train, things get darker fast.
  • Stern Chase: The overarching threat of the season is that MT is constantly being hunted by the Reflection Police.
  • The Tape Knew You Would Say That: One-One's tape for new passengers has shades of this regarding the first questions they have after waking up, though he quickly gets sidetracked from their actual concerns.
  • Time Skip: The season begins two months after Tulip has already left the train.
  • Toxic Friend Influence: Part of the reason why Jesse is on the train: he desires so much to fit in that he'll willingly engage in behaviors that he knows are wrong.
  • "Wanted!" Poster: One of these is found in The Black Market Car. MT takes it and puts it in her pocket, which Jesse later finds in "The Toad Car" when the Flects are chasing them and it falls out.
  • The Watson: Jesse serves as an excuse for M.T. to explain a few things about the Mirror World.
  • Wham Episode:
    • "The Mall Car" ends with Jesse leaving the train but MT rejected from the exit, with the final shot being MT crying on the ground while the Flects stand over her, ready to take her down.
    • The following episode, "The Wasteland", has the show's first instance of Killed Off for Real via MT grinding Mace into nothing on the train wheels.
  • What Measure Is A Nonhuman: The running theme of the season. Denizens of the train are explicitly stated by One-One to exist solely to help passengers get their number down, regardless of the fact they are fully sentient beings that often develop motivations past that. Some don't try to fight it and are fully accepting of their role (the Reflection Police), others try to manipulate the system to find at least some personal gain and satisfaction (The Cat), and still others reject the system entirely and wish to escape (MT). Beyond that, members of The Apex refuse to acknowledge the sentience of these beings and view them as nothing more than fancy toys.
    • In a meta context, it's precisely the fact that they aren't human which allowed for the violent deaths of Mace and Sieve.
  • Yank the Dog's Chain: At the end of "The Mall Car", Jesse zeroes out his number and unlocks his exit. Unfortunately, as they run through it, they learn MT is physically unable to pass through the door with him. Jesse is forced to leave without her, disappearing while they desperately try to hold each others' hands.

    Book 3: Cult of the Conductor 
  • Androcles' Lion: At the beginning of Episode 10, after Grace admits her flaws and is free of her memory tape, she helps fix the denizens of the Origami Car that Simon stepped on and crumples. At the climax of episode 10, those same origami denizens are the reason Grace survives the season; Simon kicks Grace off the train to be wheeled, but Grace survives because the origami birds grab her and fly her back up to the train.
  • Anyone Can Die: And how. By the end of the season, two of the book's four poster characters are dead. Tuba is murdered halfway through, while Simon perishes in the final episode. Grace and Hazel don't die, but the former is victim to two murder attempts, while the latter's innocence is buried six feet under.
  • Bait-and-Switch: The goal of Grace and Simon is to follow the cluster of numbers that will lead them back to the Apex. It turns out what Simon was detecting wasn't the Apex, but Amelia because of her humongous number.
  • Bait the Dog: The Book serves to flesh out and humanize the Apex more. Simon, in particular, has a number of sympathetic moments showing how he cares for Grace and the audience learns that he's been trapped on the train since he was 10. In "The Color Clock Car", he finally starts to warm up to Tuba, sharing a laugh with her and helping her through the car. The episode ends with Simon killing her by throwing her under the wheels of the train, gloating about it to Grace and Hazel, and it's all downhill for the remainder of the season.
  • Big Sister Instinct: Grace develops this for Hazel as the season continues. When Hazel decides to leave her and Simon in the penultimate episode to go with Amelia, Grace is completely devastated to lose her.
  • Bittersweet Ending: On the positive side of things, the Apex has been more-or-less disbanded. Grace and the children are now working to figure out how to move forward and help each other get off the train, Grace's number has gone significantly down (from millions in the beginning of the season to only a few hundred by the end) and Grace herself now has a denizen partner in an origami bird. However, getting to that point forced Grace to deal with the death of a sapient denizen she was slowly growing attached to, being mercilessly rejected by a child she had grown to earnestly care for as an adoptive sister and will now never see again, almost getting killed by her best friend, and then watching said best friend die himself by literally crumbling into dust. No wonder the final shot is Grace giving everyone a melancholic smile.
  • Breaking Old Trends: Book 3 has several changes to the formula established by the first two:
    • It's the first season to not have a Power Trio of main characters consisting of one human who needs to escape the train and two denizens who help them do so, instead being a Four-Temperament Ensemble. In addition, while said trios were very close True Companions by the end of their adventures, this is decidedly not the case for this season's main characters.
    • It's also the first season not to have a character zero out their number and escape the train at the end.
  • Brick Joke: In "The Mall Car", Grace tells Jesse to be careful where he aims the harpoon or he'll "end up like Lucy". Sure enough in "The Musical Car", one of the Apex girls, named Lucy, has an eye patch.
  • Call-Back:
    • Jesse's name can be seen in "The Musical Car", as the composer of an opera entitled "Empathy Goes", with the song they perform ("When I Look at You, I See Me") being one he referenced in Book 2's "The Family Tree Car".
    • The Apex have the Unfinished Car from Book 1 as the second one that they raid in the first episode. There are also corgis there, additionally calling back to how Atticus befriended King Aloysius and promised to send aid to rebuild following the events of that episode.
    • The Jungle Car where Grace and Simon meet Hazel and Tuba is the same one depicted in the Book 1 poster.
    • In "Le Chat Chalet Car", The Cat is still angry at Grace's actions over what happened in "The Lucky Cat Car".
    • The Canyon of the Golden Winged Snakes Car in the seventh episode is the same one that MT visits during her travel montage at the beginning of Book 2.
    • The Cat gives Simon a tube filled with the memory extraction robots first seen in "The Tape Car".
    • Amelia's reign as the Conductor is why cars are being ejected, as One-One is having any car she made quarantined.
    • Grace gets trapped in her own memory tape, just as Tulip did in Book 1. Grace has very similar experiences in said tape, such as distorted memories and the static almost consuming her.
  • Central Theme:
    • Empathy. The book starts off with a musical number detailing the joys of understanding other people, and the rest of the season tackles Grace's and Simon's struggles to learn empathy for denizens of the train. By the end, Grace has learned this lesson, while Simon's Lack of Empathy for denizens only gets worse and quickly expands to Hazel and Grace, unable to understand why they're beginning to fear and distrust him following his murder of Tuba. Ironic, considering that "Le Chat Chalet Car" has him begging Grace to be emphatic towards his fears and trauma.
    • Poor parental figures and caretakers. Grace alludes to her parents being inattentive, while Simon's parental figure on the train (The Cat) abandoned him to fend for himself. Hazel doesn't remember her parents, but we later learn that she is a failed clone of Alrick, with Amelia refusing to acknowledge her as a child, much less being anything akin to a daughter. More broadly, Grace and Simon are the only source of guidance for the children of the Apex, and act more as manipulative cult leaders than caretakers. The only healthy parent-child relationship shown during the season is Tuba as a surrogate mother towards Hazel.
    • Coping with shifting worldviews. The Apex hold the idea that numbers are a symbol of power and that the train exists as a playground for their personal amusement. By the latter half of Book 3, Grace has started to realize that this perspective is childish and has terrible consequences, ultimately apologizing her actions and working to reform the Apex. Whereas Simon refuses to face the truth that they've been wrong and doubles-down on his behavior, which leads to his death.
    • The damage that lies can do. The lie that Grace told a young Simon in "The Origami Car" is what would kickstart the entire Apex project. Her lying about not knowing about Hazel being a denizen results in her relationship with both Hazel and Simon being ruined. Simon rejecting the truth and becoming consumed by the lie that he's always right ends up in his death.
  • Children Raise You: ZigZagged. Grace and Simon are much more inclined to manipulate children than actually become better for them, they start to soften and open up after spending extended time with Hazel. Only for Simon to continue indulging in his old behavior and become even worse, while Grace continually chooses to save face in front of Simon over outright protecting Hazel. The poor girl ultimately abandons the duo, realizing neither are capable of providing the care and protection she needs. Only after overcoming her problems on her own does Grace truly thrive as a caretaker.
  • Cult of Personality: As noted back in Book 2, the Apex is one formed around the previous Conductor, seeing One-One as a usurper. Instead of trying to reduce their numbers, they believe they must increase them by causing mischief on the various train cars. They also have a sound wave marked across the middle of their face, denoting the analogue hijacking noise she used to control the Steward. When Amelia finds about it, she laughs at how ridiculous it all is.
  • Darker and Edgier: Featuring two sociopaths as our protagonists, this is the darkest book so far. By the end of the season, all of the main quartet has suffered to some degree: Tuba and Simon are killed (one murdered by the other, the other graphically killed by a Ghom), Hazel has become thoroughly jaded and distrustful of the world, and Grace is a victim of attempted murder at the hands of her closest friend.
  • Does This Remind You of Anything?:
    • After Simon kills Tuba, he becomes much more aggressive, gets into Grace's personal bubble and is mad that she's "not the way she's supposed to be". Combined with Hazel wanting to be strong to protect her and Grace, he comes off as an abusive boyfriend/husband, not helping that Grace is keeping secrets from Simon out of fear.
    • In "The Origami Car", Simon uses the nanobots that The Cat gave him to send Grace into her own tape against her will. He inserts himself into her memories, intentionally uses some particularly painful ones to break her will, ignores all her objections, and then just leaves her to rot when he gets what he wanted. The whole scene carries some horrifying parallels to assault, especially when Grace later wakes up, visibly disgusted and shaken by the whole affair.
  • Dramatic Irony: The Apex raid the Unfinished Car in the first episode... the car made by the Conductor they just so happen to worship. In fact, everything Grace and Simon tells about the Conductor to Hazel in "The Debutante Ball Car" is just filled with this.
  • Evolving Credits: The vanity plate during the end credits now continually changes throughout the book, showing off the current states of the protagonists. The background changes each episode as well, as does the music for Episodes 7-9.
    • "The Musical Car" has Grace and Simon's hands shown, with their huge numbers on display.
    • Starting from "The Jungle Car", Hazel and Tuba show their hands as well, with Grace and Simon's lit numbers contrasting with Hazel's unlit number and Tuba's lack of one.
    • Starting from "Le Chat Chalet Car", Grace's hand now hidden underneath her gloves, as she decides to keep it hidden after realizing it's going down.
    • Starting from "The Color Clock Car", Tuba's hand no longer appears and Hazel's now reflects her turtle transformation. And whereas Hazel's hand was happily waving in previous episodes, it now quivers uncontrollably.
    • Starting from "The Campfire Car", Amelia's hand is shown, as she is now interacting with the group.
    • "The Origami Car" has only Simon and Grace's hands present, due to Hazel and Amelia leaving at the beginning of the episode. Simon's number is rapidly climbing, while Grace's hand is being consumed by static.
    • "The New Apex" has only Grace's hand depicted following Simon's death, now uncovered and showing her number rapidly falling.
  • Family-Unfriendly Death: If you thought Mace's death was bad, this season is even worse! Simon's death is not pretty, as his skin graphically melts and his bones are turned to ash right in front of Grace and several of the kids.
  • Foreshadowing: Much of Hazel's seemingly random bits of trivia are direct references to Freeze Frame Bonuses from Book 1's "The Past Car" and thus hint towards her relation to those characters.
  • For Want of a Nail: A younger Grace in "The Origami Car" lied about how the numbers worked instead of admitting that she herself had no idea, eventually leading to the ideology of the Apex years later.
  • Getting Crap Past the Radar: The intimacy between The Cat and Frank, given how Frank first appears with his robe open and making it look like he was naked. Word of God confirms that they are in a relationship, though notes The Cat would claim it's just casual.
  • Given Name Reveal: "The Canyon of the Golden Winged Snakes Car" has Simon call The Cat Samantha.
  • Gory Discretion Shot:
    • Unlike the death of Mace in the previous season, the death of Tuba is not seen, instead having lightning crash to depict it.
    • Averted with Simon's gruesome death at the hands of a Ghom.
  • Hard Truth Aesop: Everybody is capable of redemption and everybody should be given opportunities to become better people. However, there are some people who will never redeem themselves no matter how many opportunities you give them, simply because they don't want to change their ways and/or don't want to accept that their worldview is wrong.
  • Internal Reveal: While the audience is already well aware of how the train functions and what the numbers actually mean by this point, Grace and Simon don't learn the truth until Amelia explains everything in "The Hey Ho Whoa Car."
  • Karmic Death: Simon. He meets his end with the same thing that brought him into the Apex, a Ghom. Ironically, Grace saved him from another karmic death via wheeling.
  • Know-Nothing Know-It-All: The Apex are convinced that higher numbers are better and equal power, despite it not being possible for that to be further than the truth. "The Origami Car" reveals that this started when Grace met Simon and acted like she got it that high intentionally rather than admit to being clueless.
  • Late-Arrival Spoiler: Mentioning anything about Amelia's role in this season spoils the end of Book 1.
  • The Little Detecto:
    • Simon has a device that can track passengers by their numbers. Amelia's is so large that he mistook her for the entire Apex.
    • Amelia has a scanner that can detect anomalies, things that she created during her time as the Conductor.
  • Meta Twist:
    • The Wham Episode of the last two books, each featuring some sort of death scene (Atticus and Mace, respectively) in their eighth episode. This time, the death scene happens in Episode 5, though Episode 8 is still a "Wham Episode" in its own right.
      • Instead of one major death, we get two: Tuba and Simon.
    • While Grace makes significant progress on this front, none of the passengers seen this season manage to get their numbers down to the point of leaving the train.
  • Protagonist Journey to Villain: Downplayed with Simon, who was already a sociopathic Villain Protagonist from the start, but like Grace, has some redeeming qualities and sympathetic traits shown during the first half of the season. Then he murders Tuba, and the second half sees him losing any such good qualities and becoming worse and worse, until he eventually takes up the mantle as the Big Bad of the season and tries to kill Grace, who was once his best friend.
  • "Ray of Hope" Ending: While Simon is dead, Grace decided to reform the Apex. Instead of staying on the train, they decide to help each other get home. After the credits, we see Grace's number rapidly decreasing.
  • "The Reason You Suck" Speech:
    • The beginning of Episode 10 contains one for Grace, as she's confronted by a nightmare-version of Hazel yelling at Grace for her manipulative and cowardly behavior. The nightmare Hazel even accuses Grace of killing Tuba, to which Grace responds by pointing out that it was Simon who killed Tuba. Hazel retorts that while that's true, "He didn't come up with the idea to wheel denizens on his own!"
    • The climax of Episode 10 contains one for Simon, as Grace tells him that while he's in a lot of pain and Grace can see that, Grace is not responsible for all his problems.
  • Redemption Quest: For Grace, as they progressively undergo Character Development and become a better person over the course of the season, making a Heel–Face Turn by the end.
  • Reformed, but Not Tamed: Amelia is trying to be a better person, but 30+ years of limited social interaction has not helped things, and she has a card by One-One to remind her that the passengers matter.
  • Ship Tease: It's very heavily implied in the first few episodes of Book 3 that Simon has a thing for Grace due to him frequently blushing or smiling when she shows him affection. Grace for her part doesn't seem to be in love with Simon, but she clearly cares for him deeply, while also being comfortable enough to casually touch him or play with his hair several times.
    • The two are also paired together as dance partners in The Debutante Car and seem to have fun, particularly Simon, in spite of being the most opposed to it initially.
    • When Grace apologizes in "Le Chat Chalet Car" for ignoring how troubled Simon was, she reveals that her number has been going down, getting uncharacteristically vulnerable. When he assures her that he'll always be with her, she embraces him tightly.
    • Simon's feelings for Grace take a dark turn in the second half of the book, where he starts acting like an abusive boyfriend to her. By the end of the season, any feelings he once had for her have been completely destroyed.
  • Shoo Out the Clowns: Hazel leaving with Amelia at the start of Episode 9 is when things start getting darker fast, not that they weren't dark enough already by that point.
  • Villain Protagonist: The two main characters of the season, Grace and Simon, are members of the hedonistic Apex, which is sadistic and cruel to the train's denizens. Over the course of the Book, Grace gets better and performs a Heel–Face Turn by the end, while Simon gets even worse and becomes the Big Bad.
  • We Used to Be Friends:
    • Simon and The Cat were close when the former first came to the train, as she was his denizen companion. But after she accidentally abandoned him when they were running from a Ghom and never came back to save him, he became extremely bitter and grew to resent not just her, but all the train's denizens.
    • By the end of the season, Grace and Simon — best friends, with the latter clearly having a crush on the former — have become this. He leaves her trapped in her own memories, takes over the Apex, and tries to murder her when she returns, even after she saves his life.
  • Wham Episode:
    • "The Color Clock Car" ends with Simon killing Tuba, as well as the reveal that Hazel isn't human.
    • "The Hey Ho Whoa Car" reveals that Hazel is one of Amelia's failed attempts to recreate Alrick, and that any car with her in it will be ejected if/when the scanning pulse hits it. Simon also views a tape of Grace's memories and finds out that she purposefully didn't tell him about Hazel's inhuman status.
  • What Measure Is a Non-Human?: A theme returning from the previous book. When Tuba is murdered by Simon, Simon shows no remorse for his actions, whereas Grace is furious when told and later saddened when forced to dwell on it. In addition, when Hazel is revealed to be a denizen herself, it spurs Grace to become more of a protective mother/older sister figure to her. Unfortunately, Grace degrading her to save her own skin a few episodes later makes Hazel feel that Grace doesn't care about her, and thus the turtle girl leaves with Amelia (who doesn't even recognize the girl as anything more than a failed experiment).

 
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Infinity Train: Book 3

Simon has the life drained out of him by a Ghom, causing his flesh to melt off before his skeleton becomes nothing but ash.

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