Fionna and Simon discover their best selves, and a possible solution to all their problems, in a wintery kingdom. Marshall Lee helps Gary with a baking project.

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

While learning more about their connection from Prismo, Fionna, Cake and Simon become the target of a dangerous new enemy.

After crash-landing in a fantastic new world, Cake takes on Ooo, while a desperate Fionna continues her search. Later, Simon opens the portal one last time.

Simon struggles to be a regular human in a magical world and considers taking desperate measures.

After a disastrous morning, Fionna can't afford to take Cake to the vet, so she seeks help from an unconventional source.