Adventure Time: Fionna and Cake is an upcoming American animated streaming television series. It is a spin off of the Cartoon Network series Adventure Time, which was created by Pendleton Ward. The third series in the franchise, it was announced on August 17, 2021 and will be released via HBO Max. The show will focus on the titular characters, Fionna the Human and Cake the Cat, alternative versions of main characters from the original series who had previously appeared in several episodes. The series will be executive produced by Adam Muto, who had served as showrunner for the latter half of Adventure Time and oversaw production of the Distant Lands specials. Ten half-hour episodes have been confirmed.