Adventure Time: Fionna and Cake

Adventure Time: Fionna and Cake is an American adult animated television series developed by Adam Muto for the streaming service HBO Max. It is a spin-off of the Cartoon Network series Adventure Time (2010–2018) and the third main installment in the Adventure Time franchise. The series debuted on August 31, 2023, and the second season premiered on October 23, 2025.