Infinity Train Wiki
Infinity Train Wiki

This article is about the television series. Did you mean the pilot or the vehicle and setting?

Infinity Train is a Cartoon Network animated series created by Owen Dennis about a young girl named Tulip and her friends, One-One and Atticus, traversing through a seemingly infinite train with unlimited possibilities in order to find her way home.

The pilot episode was first shown on November 2, 2016, on Cartoon Network's YouTube channel. The pilot's popularity ultimately lead to Cartoon Network airing the pilot on television on February 11, 2017.[1]

On March 2, 2018, Cartoon Network launched a teaser on their official website confirming that Season 1 of the show will launch in 2019.[2]

In July 2019, the show was confirmed for an August 5, 2019 debut[3] and the first episode was released early on Cartoon Network's website. The week-long airing was promoted as a miniseries, only for the surprise reveal immediately following the final episode that the series would return.

On November 22, 2019, the official Infinity Train website was updated with a new claw machine puzzle. Completing the puzzle leads to a trailer for Season 2.[4]

On July 6, 2020, it was announced that Season 3 will be released exclusively on HBO Max.[5]

On February 17th, 2021, Season 4 was formally revealed through HBO Max's Twitter.[6] It was promoted as the final season due to the show not being renewed, although the crew has supported fan efforts to demand more seasons.


Infinity Train was first imagined by Dennis in 2010 while riding a plane home to the United States from China. Initially, he wondered what would happen should a girl be trapped on a plane, but eventually discarded the idea, stating "there wasn't really a lot to explore if [the setting] is a plane."[7]

He later changed the setting to a train.[7] According to Dennis, not much else about Infinity Train's origin can be revealed due to it containing heavy spoilers for the series itself.[7]

Dennis pitched the idea of the series to Cartoon Network in January 2014.[8] Upon the initial pitch, Cartoon Network executives feared that the series would be too similar to Over the Garden Wall, then referred to as Tome of the Unknown.[9]

The logo for the Infinity Train pilot.

Eventually, the two shows were deemed different enough, and Dennis received permission to create a pilot. The pilot went into production around 2015.[8] The initial concept did receive edits and changes when Dennis viewed the completed version of Over the Garden Wall, however.[9]

Additionally, Dennis often held other fears about Infinity Train's similarities to other media when it was first created, citing films Snowpiercer and Galaxy Express 999 that came out later in the year.

Within the network itself, fellow Cartoon Network storyboard artist Cole Sanchez told Dennis that Adventure Time had created an episode featuring a train with infinity symbols on it, which caused Dennis's "stomach to turn."[9] He eventually overcame these fears, stating "There are certain ideas just... sitting there, plucked up by anyone who feels like they wanna do something with it. The most you can do is just keep making the thing you’re trying to make with the voice you want to make it in."[9]


Book Name Episodes Originally aired Network
First aired Last aired
Pilot February 11, 2017
1 The Perennial Child 10 August 5, 2019 August 9, 2019 Cartoon Network
Shorts The Train Documentaries 10 October 19, 2019 November 16, 2019
2 Cracked Reflection 10 January 6, 2020 January 10, 2020 Cartoon Network
3 Cult of the Conductor 10 August 13, 2020 August 27, 2020 HBO Max
4 Duet 10 April 15, 2021



  • It was confirmed in a Cartoon Network official YouTube video by Owen Dennis that the pilot episode takes place in November.
  • The initial idea of the show came from Owen's experiences while traveling on a plane.
  • Owen Dennis has stated that Cartoon Network executives are "allowing us to do some things content-wise that other shows might not normally be able to do, simply because Infinity Train already has a fanbase."[10]
  • Unusual for a cartoon, Infinity Train's voiceovers are mostly recorded in group sessions, with as much of the cast and guest actors for an episode recording in the same booth.[11]
  • Following the release of Book 4, Owen Dennis hosted a Reddit AMA and spoke in various interviews where he provided some insight into where the show would have gone if they were able to make eight books:
    • Book 5 was planned to be a film documenting the exact nature of Amelia's takeover of the train, which is only briefly hinted at in Book 4. The film made it as far as a completed script and even storyboards, some of which were leaked in early 2021 when the crew yearbook was posted online.[12][13] The film's plot would have run parallel to the events of Book 4.[14] However, Cartoon Network Studios passed on the film as they felt its focus on an adult woman grieving for her partner did not have a "child entry point." Dennis notes whether this film and the rest of the series will be made or not depends on fan engagement.[15]
    • Dennis has previously defined each book by a particular keyword: Book 1 was a mystery, Book 2 was an adventure, Book 3 was a tragedy, and Book 4 was a comedy. For the unreleased books, he revealed that Book 5 would have been about grief, Book 6 about guilt, Book 7 about revenge, and Book 8 about acceptance.[16]
    • Book 6 would have featured a character who has not been introduced yet in the series.[17]
    • Book 8 would have touched upon Alzheimer's Disease, inspired by a book Owen Dennis's grandfather wrote about slowly succumbing to it.[18]
    • Amelia and Hazel were slated to return at some point, and their relationship as creator and creation would have been explored.[19]
    • One of the planned books would have centered around an older Tulip.[19]
    • There were plans for a Christmas special.


  1. My pilot for Cartoon Network was just released! It's about a girl, her robot, and a corgi on an Infinity Train! – Owen Dennis! on Twitter
  7. 7.0 7.1 7.2 "5-Pizza Party Podcast – FT: Owen Dennis INFINITY TRAIN Creator" (at times 2m18s, 2m33s, 2m55s)
  8. 8.0 8.1
  9. 9.0 9.1 9.2 9.3 They didn’t inspire each other. If I were to guess, The Adventure Time episode and Infinity Train were probably thought of around the same time period. – Owen Dennis' Tumblr
  10. "They’re also allowing us to do some things content-wise that other shows might not normally be able to do, simply because Infinity Train already has a fanbase." - Owen Dennis on Reddit
  11. Kyle McCarley. "Bella, @DianeDelano and I were there for every group record together. Kirby Howell-Baptiste was there whenever her schedule allowed, as were a rotating cast of phenomenal actors who came in for some of the guest roles. Group records are the best... Usually :P" Twitter. August 14, 2020.
  14. Interview with Comic Book Resources
  15. Why there is no Infinity Train movie.
  17. Information on Book 6.
  18. Owen Dennis on Alzheimer's.
  19. 19.0 19.1 Inverse Interview with Owen Dennis