 The series follows the adventures of Finn (voiced by Jeremy Shada), a human boy, and his best friend and adoptive brother Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will. In this episode, Marceline the Vampire Queen (voiced by Olivia Olson) reveals that 996 years prior to the events of the series, she and the Ice King (voiced by Tom Kenny) — then a human named Simon Petrikov — wandered the post-apocalyptic land after the cataclysmic Mushroom War.
