The show is set in the fictional "Land of Ooo", in a post-apocalyptic future about a thousand years after a nuclear holocaust called the "Great Mushroom War". The show takes place "after the bombs have fallen and magic has come back into the world. Twelve- year-old Finn battles evil in the Land of Ooo. Assisted by his magical dog, Jake, Finn roams the Land of Ooo righting wrongs and battling evil. Usually that evil comes in the form of the Ice King.