It follows the adventures of Finn (a human boy) and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will.

The season was storyboarded and written by Sam Alden, Graham Falk, Erik Fountain, Polly Guo, Tom Herpich, Seo Kim, Patrick McHale, Adam Muto, Hanna K. Nyström, Kent Osborne, Aleks Sennwald, Somvilay Xayaphone, and Steve Wolfhard.

The season's multi-episode story arcs include Princess Bubblegum confronting her antagonistic Uncle Gumbald, Finn dealing with Fern's embrace of the dark side, and Betty trying to turn the Ice King back into Simon Petrikov.

The series follows the adventures of Finn the Human (a boy) and his best friend Jake, a dog with magical powers to change shape and size at will.

Common storylines revolve around Finn and Jake discovering strange creatures, dealing with the antagonistic-but-misunderstood Ice King, and battling monsters to help others.

[1] The season's multi-episode story arcs include Princess Bubblegum confronting her antagonistic Uncle Gumbald,[2] Finn dealing with Fern's embrace of the dark side,[3] and Betty trying to turn the Ice King back into Simon Petrikov.

[8][9] According to series showrunner Adam Muto, the number of episodes ordered by the network as part of the season was substantially lower than it had been, leading the production crew to think "that if this wasn't the end, it was coming up soon.

[13][14][15] Storyboard artists who worked on this season included Sam Alden, Polly Guo, Seo Kim, Somvilay Xayaphone, Steve Wolfhard, Tom Herpich, Graham Falk, Kent Osborne, Hanna K. Nyström, Aleks Sennwald, Erik Fountain, and Patrick McHale.

[a] Ghostshrimp, the series' former lead background designer, returned to work on the "final story arc of Adventure Time" proper.

It is sad, and everyone's kind of grieving, but it's hard to feel too bad about it because ... they have so many episodes in the bank that it's gonna play for another couple years.

The party featured a DJ booth shaped like Finn and Jake's tree fort, a live band, and Adventure Time-related food.

[36] Several crew members were hired for Cartoon Network's Summer Camp Island, created by Adventure Time storyline writer Julia Pott, after the latter's final season ended.

[37] Voice actors for the season included Jeremy Shada (Finn the Human), John DiMaggio (Jake the Dog), Tom Kenny (The Ice King), Hynden Walch (Princess Bubblegum), and Olivia Olson (Marceline the Vampire Queen).

Former storyboard artist Niki Yang voiced sentient video-game console BMO in English and Jake's girlfriend, Lady Rainicorn, in Korean.

Day and Scharpling returned in the series finale, "Come Along with Me",[58][59] which also featured Willow Smith as Beth the Pup Princess, Sean Giambrone as Shermy, Bettie Ward as a dream poodle, Jill Talley as Maja, and Ashley Eriksson as the music hole.

"[71] Entertainment Weekly argued that the finale was one of the "Best TV episodes of 2018", writing: "'Come Along with Me' is equal parts silly and sad, with music playing a major role.