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.
In July 2019, the show was confirmed for an August 5, 2019 debut 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.
On February 17th, 2021, Season 4 was formally revealed through HBO Max's Twitter. 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."
Dennis pitched the idea of the series to Cartoon Network in January 2014. 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.
Eventually, the two shows were deemed different enough, and Dennis received permission to create a pilot. The pilot went into production around 2015. The initial concept did receive edits and changes when Dennis viewed the completed version of Over the Garden Wall, however.
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." 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."
|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|
- 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."
- 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.
- Owen has previously revealed hints unfinished projects which include concepts of seasons, a short, two games.
- The main reason why the pilot was picked up is because after the MeToo movement Cartoon Network realized they needed more female protagonists. Before the movement Owen Dennis was told his pilot might not get picked up because his main character, Tulip, is a girl. 
- "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
- "‘Infinity Train’: Cartoon Network Series Set For Five-Day Rollout Next Month." from Deadline
- "Exclusive: Infinity Train's Third Season Is Bringing Anarchy to HBO Max" from Gizmodo
- Announcement of Book 4 on HBO Max's Twitter.
- "5-Pizza Party Podcast – FT: Owen Dennis INFINITY TRAIN Creator" (at times 2m18s, 2m33s, 2m55s)
- 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
- "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
- 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.
- "Well nobody's watching The Powerpuff Girls just to see the professor" (Timestamp: 1:00:08 - 1:03:53)