The duo explore their relationship and the mysterious land of Ooo. Fionna and Cake with the help of the former Ice King, Simon Petrikov embark on a multiverse-hopping adventure and journey of self-discovery. All the while a powerful new antagonist determined to track them down and erase them from existence, lurks in the shadows.
After a disastrous morning, Fionna can't afford to take Cake to the vet, so s...