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Overview




Book Four - Duet is the fourth and (as of now) final season of the Cartoon Network series Infinity Train and serves as a standalone prequel to the three previous books. It premiered on April 15, 2021, on HBO Max.

Min-Gi and Ryan are childhood best friends who dreamed of performing in a band and traveling across Canada, together. After a sudden falling out splits them apart, both find themselves aboard the mysterious Infinity Train. Lost and confused, they meet Kez, a free-spirited concierge bell, who accompanies them on their journey. As tensions rise and old wounds come to light, both Min-Gi and Ryan must decide if they can work together or else risk losing themselves forever aboard the Infinity Train.[2]

Book Four was teased by HBO Max's twitter on February 17, 2021.[3] More information about this season and an official trailer was eventually released March 11 of the same year by Entertainment Weekly.[4]HBO continued to advertise Infinity Train. On March 25, 2021 the poster for Book 4 and a more detailed synopsis was released on HBO Max's Twitter. To further boost interest, an exclusive clip was released on YouTube on April 8, 2021.

Though the final season released to date, Book Four was not intended to be the final season of Infinity Train: the writing staff had written enough stories to last eight seasons.[5] The story that came closest to completion was the show's fifth installment, which would have run parallel to the events of this season and followed Amelia's journey.

Cast and Crew[]

Voice Cast[]



Production Crew[]

Writers

Character, Prop, & Effects Designers

  • Erik Caines (Design Supervisor)

Episodes[]

Image Title Premiere Date No. in series No. in season
The Twin Tapes "The Twin Tapes" April 15, 2021 (HBO Max) 31 1
Min and Ryan’s lifelong friendship and creative partnership disintegrates.
The Iceberg Car "The Iceberg Car" April 15, 2021 (HBO Max) 32 2
Min and Ryan wake up on the train and meet Kez, a talking, floating concierge bell.
The Old West Car "The Old West Car" April 15, 2021 (HBO Max) 33 3
Ryan, Min, and Kez get thrown into an Old West jail.
The Pig Baby Car "The Pig Baby Car" April 15, 2021 (HBO Max) 34 4
Ryan, Min, and Kez have to make the perfect dessert for a very fussy baby.
The Astro Queue Car "The Astro Queue Car" April 15, 2021 (HBO Max) 35 5
The trio sneaks into a guarded nightclub astro tower.
The Party Car "The Party Car" April 15, 2021 (HBO Max) 36 6
If they want to move forward, Min and Ryan must play their first show together since splitting up the band.
The Art Gallery Car "The Art Gallery Car" April 15, 2021 (HBO Max) 37 7
The gang needs to escape from a haunted art museum.
The Mega Maze Car "The Mega Maze Car" April 15, 2021 (HBO Max) 38 8
While they accompany Kez to her home, Min and Ryan air their grievances with each other.
The Castle Car "The Castle Car" April 15, 2021 (HBO Max) 39 9
Ryan and Min finally meet Kez’s roommate.
The Train to Nowhere "The Train to Nowhere" April 15, 2021 (HBO Max) 40 10
Min and Ryan face a final challenge.



Gallery[]

Click here to view the image gallery for Book Four - Duet.
Click here to view this page's gallery.


Videos[]

Trivia[]

  • When the teaser for the fourth season was released, Owen Dennis joked on Twitter that the book's title was "Demon Slayer", a reference to the anime of the same name and its 2020 film Demon Slayer: Kimetsu no Yaiba the Movie: Mugen Train, which in some territories was known as Demon Slayer: Infinity Train. Dennis claimed it was the show's way of getting revenge on said anime.[6] A month later he confirmed the official title of "Duet" after the official trailer was released.
  • Owen Dennis believes that Book 4 could be binged or watched at the viewers' own pace. Compared to the previous books, Book 4 works better binged. Ultimately, he doesn't have a preferred way for fans to watch it and hopes people enjoy it.[7]
  • Dennis noted that Book 4 was very much written with the idea of subverting the previous three seasons: they were aware the audience was expecting some form of traumatic event or death, and wished to do the opposite after the dark tones of Book 3.[8][9]
  • Unlike the three previous seasons, Book Four does not have evident story themes to any classic children's literature. Instead, the characters of Ryan and Min-Gi are respectively inspired by Piskarev and Pirogov from Nikolai Gogol's short story Nevsky Prospekt.[10]
    • In "The Twin Tapes" Min references Gogol's story by suggesting "Nevsky and the Prospekts" as a band name.
  • Book 4 was initially planned to be about two bank robbers from the old west.[11]
  • Dennis hinted the story of Book 4 way before it was officially confirmed during the Book 3 AMA. It was cleverly worded as a joke. [12]

Continuity[]

  • Unlike the previous books, Book Four is a prequel season that is set around 33 years[13] before Tulip's journey[14] in the mid 1980s. Specifically between 1985-1986 as confirmed in "The Twin Tapes" where a bumper sticker on the back of Ryan's van says "Class of 1985". The mid 80s was an important era for Infinity Train history. This is the exact era when the first conductor looses his position. In the sidelines a younger Amelia learns how the train works from One. Her rise to power is inferred throughout the season.
    • As such, it is the only book where Grace and Simon do not appear, as they have not yet been born.
    • This is also the only book where Samantha makes no appearances alongside Randall, as they do not meet until "The Beach Car".
    • It is the only book where the Corginian Corgis do not make an appearance.
  • This is the first season since Book One to not have a main character be a character introduced in a previous season.
  • This is the only book not to feature Ghoms.

References[]

ve Episodes
Pilot

Infinity Train (pilot)

Book One

The Grid CarThe Beach CarThe Corgi CarThe Crystal CarThe Cat's CarThe Unfinished CarThe Chrome CarThe Ball Pit CarThe Past CarThe Engine

Minisodes

The Green CarThe Tiny Wizard CarThe Kaiju CarThe Tech Support CarThe Snow CarThe Hill CarThe Movie Theater CarThe Cross-Eyed Ducks CarThe Minecart CarThe Wedding Cake Car

Book Two

The Black Market CarThe Family Tree CarThe Map CarThe Toad CarThe Parasite CarThe Lucky Cat CarThe Mall CarThe WastelandThe Tape CarThe Number Car

Book Three

The Musical CarThe Jungle CarThe Debutante Ball CarLe Chat Chalet CarThe Color Clock CarThe Campfire CarThe Canyon of the Golden Winged Snakes CarThe Hey Ho Whoa CarThe Origami CarThe New Apex

Book Four

The Twin TapesThe Iceberg CarThe Old West CarThe Pig Baby CarThe Astro Queue CarThe Party CarThe Art Gallery CarThe Mega Maze CarThe Castle CarThe Train to Nowhere

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