After a disastrous morning, a down-on-her luck Fionna seeks treatment for an out-of-sorts Cake.

Struggling to find his place as a human in a magical world, Simon considers taking desperate measures before embarking on a quest with an old friend.

While Cake crash-lands in a fantastic new world, Fionna continues her search after witnessing something impossible.

Fionna, Cake, and Simon converge in a strange place to discover how they're connected.

Pursued by a powerful enemy, Fionna, Cake and Simon venture through a lawless world in search of a magical artifact.

After landing in the Winter Kingdom, Fionna and Simon discover a possible solution to their problems. Marshall Lee helps Gary with a baking project.

Cake is recruited by a band of skilled vampire hunters. Gary and Marshall Lee attend a black-tie party.

While Simon experiences a cosmic detour, doom closes in on Fionna and Cake.

Simon battles his demons as Fionna, Cake and friends fight for their world.