Adventure Time: Fionna and Cake The Adventure Time spin-off Adventure Time: Fionna and Cake follows the exploits of Finn the Human and Jake the Dog. This show centers on Fionna the Human and Cake the Cat, the gender-flipped counterparts of Finn and Jake. Simon Petrikov, a character who spent the most of Adventure Time as the Ice King, also appears in the show. The characters in Adventure Time: Fionna and Cake traverse the multiverse while being pursued by "a powerful new antagonist" who is "determined to track them down and erase them from existence."