Finn is a fiery little kid with strong morals, he is a hero of the land of Ooo, his best friend and adoptive brother, Jake, has magical powers to change shape and size at will. While Jake is somewhat care-free, he will sit Finn down and give him some decent advice if he really needs it. Finn and Jake live in the post-apocalyptic Land of Ooo, which was ravaged by a cataclysmic event known as the "Mushroom War", a nuclear war that destroyed civilization a thousand years before now.