Based on characters from the beloved “Adventure Time” franchise, this brand-new 10-episode series set in the land of Ooo follows the alternate universe versions of Finn & Jake on a multiverse-hopping journey towards self-discovery. When Fionna and her sidekick Cake find themselves in the crosshairs of a powerful new foe, they have no choice but to seek the help of former Ice King Simon Petrikov. br br Adventure Time: Fionna and Cake premieres August 31, only on Max.