Adventure Time: The Kingdom of Ooo/Home media

Theatrical release
The film was released in theaters in the United States and United Kingdom on August 3, 2018, by Warner Bros. Pictures, followed by a United Kingdom bow a week later, on the same year as Cartoon Network's previous film We BARE BEARS: The Movie. The film will be presented in a 1.85:1 format, rather than Warner Animation Group's standard 2.39:1 format on its previous titles. It is scheduled to be released in Australia on September 27, 2018. The movie's theatrical release will be preceded by The Creature Quest, a short film based on Cartoon Network's animated television series The Heroic Quest of the Valiant Prince Ivandoe, created by The Amazing World of Gumball's animators Eva Lee Wallberg and Christian Bøving-Andersen.

Home media release
The film was released on Digital on October 16, 2018 and Blu-Ray and DVD on November 6, 2018. It contains the deleted scenes, the Heroic Quest of the Valiant Prince Ivandoe short film The Creature Quest, the 18-minute featurette, featuring interviews with most of the principal cast and crew, animatics, the deleted ending, the pilot episode, the audio commentary and a sneak peek of The Amazing World of Gumball: The Movie.