<P> The ninth and final season of Adventure Time , an American animated television series created by Pendleton Ward , premiered on Cartoon Network on April 21 , 2017 . It is set to conclude sometime in 2018 . The season was produced by Cartoon Network Studios and Frederator Studios . The season will follow 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 . </P>
when does the new adventure time come out
April 21 , 2017