Productionįormer lead background artist Ghostshrimp returned to work on several episodes this season. Multi-episode story arcs for this season include Finn and Jake undoing extreme elemental magic which had transformed Ooo into a dystopia while they were away at sea, and Fern (Finn's grass-based doppelgänger) struggling with his identity and eventually succumbing to evil impulses. Common storylines revolve around Finn and Jake discovering strange creatures, dealing with the antagonistic-but-misunderstood Ice King, and battling monsters to help others. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other major characters: Princess Bubblegum, the Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess. The series follows the adventures of Finn the Human (a boy) and his best friend, Jake, a dog with magical powers to change shape, grow, and shrink at will. A set containing the entire season was released on September 4, 2018. Cartoon Network Studios and Frederator Studios produced the season. For her work on the episode 'Ketchup', Lindsay Small-Butera won an Emmy Award for Outstanding Individual Achievement in Animation at the 70th Primetime Emmy Awards. Critical reception of the season was mainly positive, with the episodes making up Elements largely well-received. The ninth-season finale, 'Three Buckets', was watched by 0.85 million (the lowest-rated Adventure Time season finale at the time). It began with ' Orb', which was watched by 0.71 million viewers (a decrease from the previous-season finale, 'Islands Part 8: The Light Cloud', which was seen by one million viewers). The season also features guest animators Alex and Lindsay Small-Butera, who worked on ' Ketchup'. Finn and Jake join Ice King (voiced by Tom Kenny), Betty (voiced by Felicia Day), and Lumpy Space Princess (voiced by Pendleton Ward) to set things straight. During this season the miniseries Elements aired, which follows Finn, Jake, and BMO after they return home to discover that extreme elemental magic has turned Ooo into a dystopia.

The season was storyboarded and written by Adam Muto, Sam Alden, Polly Guo, Seo Kim, Somvilay Xayaphone, Laura Knetzger, Steve Wolfhard, Tom Herpich, Graham Falk, Kent Osborne, Hanna K. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess.

The season 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 ninth season of Adventure Time, an American animated television series created by Pendleton Ward, premiered on the Cartoon Network on April 21, 2017.

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