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After experiencing a series of strange dreams, a down-on-her-luck Fionna Campbell seeks answers from friends Gary Prince and Marshall Lee. But when her cat, Cake, starts exhibiting odd behavior, Fionna must turn to an unlikely source for help.

Years after last donning the mantle of Ice King, Simon struggles to find his place as a human in a magical, ever-changing Ooo. Desperate to forget his time as the author of the ever-popular Fionna and Cake series, Simon embarks on an adventure with an old friend – and attempts to reconnect with a figure from his past.

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.

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

After crash-landing on an increasingly lawless Farmworld, Fionna, Cake and Simon search for a magical artifact while trying to evade the powerful Scarab. Later, Fionna and her newfound friends clash with the infamous Destiny Gang.

After arriving in the Winter Kingdom, Fionna and Simon discover their best selves ... and a possible solution to their problems. Back home, Marshall Lee helps Gary prepare for a once-in-a-lifetime opportunity.

When Cake is recruited by a band of vampire hunters in an alternate Ooo, Fionna and Simon struggle to keep up. At a black-tie party, Marshall Lee finds himself dragged back into his mother's world, leaving Gary to hobnob with elites who could help his dreams become a reality.

Stranded in a desolate wasteland, Fionna, Cake and Simon encounter old friends and enemies alike -- and must resort to desperate measures to escape. After running afoul of his superiors, Scarab attempts to continue his pursuit.

Returning to a familiar land, Fionna and Cake look toward an uncertain tomorrow and deal with an invasion. Meanwhile, Simon finds himself spirited away to the last place he expected.

As Simon battles his demons to obtain the artifact, Fionna, Cake and their friends join forces in a final bid to protect their world from the Scarab.