BMO narrates "The Great Gum War" in which Finn, Jake, Marceline, PB and the Candy Kingdom go to war against Gumbald and his army that will determine the fate of Ooo once and for all.
After the death of Prismo, Finn and Jake do a funeral ritual. But when Jake eats the last pickle of the jar of pickles that Prismo made for him, he is transported to Prismo's lair. Will Finn be able to save him?