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

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

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.

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