As time runs out for a wounded hero, PB turns to science for solutions, while Huntress fights to make her way back to Ooo to stop her. Later, Fionna seeks to undo a disastrous decision.

 After plunging into the unknown, Huntress faces off with an old foe, Fionna contends with painful memories, and Cake confronts her inner truth with help from the Karmic Worm.

 After Fionna and Huntress are captured, Cake tries to pull off Boys Night and save the lot on her own. Meanwhile, PB, Simon, and Marcie venture into the forest.

 When DJ Flame goes missing, Fionna turns to magic -- and an unlikely ally -- for help with the search. As Huntress attempts to navigate the Heart of the Forest alone, Marshall learns a critical truth about his mother.

 While Fionna's latest bid to save the lot throws Marshall for a loop, Huntress Wizard chases the Cosmic Owl. Later, Fionna and Huntress attempt to save Finn from an impending Croak Dream.

 After several setbacks, Fionna's quest to save the lot takes a costly turn, while Huntress and Cake begrudgingly join forces to explore an enigmatic vision of the future.

 A heartbroken Fionna takes a walk down memory lane, while Cake explores a career in television. Later, Huntress Wizard searches for a way home.

Given just a week to save the lot, Fionna puts together a fundraiser and revisits an old flame. As a nervous Cake goes on a first date, Huntress Wizard struggles in a magic-free world. Back in Ooo, PB and Marceline face down a hoard of eager Princesses.

While Fionna, Cake, and their friends strategize different ways to take back their lot from Queenie, Huntress Wizard travels to the Heart of the Forest and contends with a secret order of Wizards.

 After saving their world from Scarab, Fionna and Cake attempt to find a place for themselves in it while helping their friends make a home out of an abandoned lot. Back in Ooo, Huntress Wizard makes a shocking discovery -- and turns to Simon for help.