When a witch doctor's foul sorcery hurls the ape-man's soul out of his magnificent body, Tarzan finds himself marooned on a weird, treeless landscape - a dying planet inhabited by creatures unknown to him. For on Barsoom - as Martians style their home planet - there exists apes. Great apes of a type not found upon Earth. Hairless giants resembling gorillas, but possessing two sets of arms. Not to mention ferocious lion-like monsters known as banths as well as the elephantine zitidars. Unarmed and hungry, Tarzan must hunt these fearsome beasts, and so begins the perilous trek that elevates the former jungle lord from naked castaway to the undisputed Ape-lord of Barsoom!