| Adventure Time | |
|---|---|
| Season 9 | |
 Region B Blu-ray case | |
| Starring | |
| No. of episodes | 14 |
| Release | |
| Original network | Cartoon Network |
| Original release | April 21 – July 21, 2017 |
| Season chronology | |
The ninth season of Adventure Time, an American animated television series created by Pendleton Ward, premiered on the Cartoon Network on April 21, 2017 and concluded on July 21, 2017, and was produced by Frederator Studios and Cartoon Network Studios. 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. 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 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. Nyström, and Aleks Sennwald. 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. 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. The season also features guest animators Alex and Lindsay Small-Butera, who worked on "Ketchup".
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 ninth-season finale, "Three Buckets", was watched by 0.85 million (the lowest-rated Adventure Time season finale at the time). Critical reception of the season was mainly positive, with the episodes making up Elements largely well-received. 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. A set containing the entire season was released on September 4, 2018.