Book Four - Duet

Overview

Gallery

Book Four - Duet
Episodes
Episodes	10
Premiere Date	April 15, 2021
Chronological order
Previous	Book Three

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.

Book Four was teased by HBO Max's twitter on February 17, 2021. More information about this season and an official trailer was eventually released March 11 of the same year by Entertainment Weekly.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. 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

Main Sekai Murashige as Ryan Akagi Johnny Young as Min-Gi Park Minty Lewis as Kez Supporting Margaret Cho as Morgan Lena Headey as Amelia Hughes Jeremy Crutchley as One Kate Mulgrew as Samantha Kari Wahlgren as Parka Denizen 1 and Parka Denizen 2 Keith Ferguson as Parka Denizen 3 Margo Martindale as Caterpillar Sheriff (Judge Morpho) J.K. Simmons as Pig Baby Audrey Wasilewski as Cow Creamer Owen Dennis as Brando Donald Faison as Beehive Thomas Lennon as Spiceman

Production Crew

Writers

• Justin Michael (eps: 1, 6, and 8)
• Lindsay Katai (eps: 2, 4, and 9)
• Alex Horab (eps: 3, 5, 7, and 10)

Character, Prop, & Effects Designers

• Erik Caines (Design Supervisor)

• Megan Phonesavanh
• Allison Kim

Episodes

Image	Title	Premiere Date	No. in series	No. in season
	"The Twin Tapes"	April 15, 2021 (HBO Max)	31	1
	Min and Ryan’s lifelong friendship and creative partnership disintegrates.
	"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"	April 15, 2021 (HBO Max)	33	3
	Ryan, Min, and Kez get thrown into an Old West jail.
	"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"	April 15, 2021 (HBO Max)	35	5
	The trio sneaks into a guarded nightclub astro tower.
	"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"	April 15, 2021 (HBO Max)	37	7
	The gang needs to escape from a haunted art museum.
	"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"	April 15, 2021 (HBO Max)	39	9
	Ryan and Min finally meet Kez’s roommate.
	"The Train to Nowhere"	April 15, 2021 (HBO Max)	40	10
	Min and Ryan face a final challenge.

Gallery

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Videos

Infinity Train Book 4 - Teaser - HBO Max

Infinity Train Book 4 - Official Trailer - HBO Max

Book 4 Exclusive Clip - Infinity Train - HBOMax

Infinity Train Book 4 - Opening Scene - HBO Max

Train to Nowhere Music Video - Infinity Train - HBO Max

(Spoiler warning)

Infinity Train - All the Feels from Books 1-4 - HBO Max

Infinity Train - All The Songs in Books 1-4 - HBO Max

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. 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.
• 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.
• 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.
  • 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.
• 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.

Continuity

• Unlike the previous books, Book Four is a prequel season that is set around 33 years before Tulip's journey 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

v • e Episodes Pilot Infinity Train (pilot) Book One The Grid Car • The Beach Car • The Corgi Car • The Crystal Car • The Cat's Car • The Unfinished Car • The Chrome Car • The Ball Pit Car • The Past Car • The Engine Minisodes The Green Car • The Tiny Wizard Car • The Kaiju Car • The Tech Support Car • The Snow Car • The Hill Car • The Movie Theater Car • The Cross-Eyed Ducks Car • The Minecart Car • The Wedding Cake Car Book Two The Black Market Car • The Family Tree Car • The Map Car • The Toad Car • The Parasite Car • The Lucky Cat Car • The Mall Car • The Wasteland • The Tape Car • The Number Car Book Three The Musical Car • The Jungle Car • The Debutante Ball Car • Le Chat Chalet Car • The Color Clock Car • The Campfire Car • The Canyon of the Golden Winged Snakes Car • The Hey Ho Whoa Car • The Origami Car • The New Apex Book Four The Twin Tapes • The Iceberg Car • The Old West Car • The Pig Baby Car • The Astro Queue Car • The Party Car • The Art Gallery Car • The Mega Maze Car • The Castle Car • The Train to Nowhere