 In the context of the series, Marceline the Vampire Queen is a thousand-year-old vampire. The Ice King is a recurring antagonist of the series, and frequently kidnaps princesses throughout Ooo; although he is often at odds with Finn and Jake, he is generally not a serious threat. In the fourth season episode "I Remember You", it was revealed that Marceline and the Ice King had originally met following the events of the mysterious Mushroom War, a cataclysmic war that destroyed modern human society.
