Caught between two worlds, a man who was orphaned in the African jungle as a baby and raised by apes has grown to rule and to protect the wild beasts, a hero known only as Tarzan. Tarzan (Johnny Weissmuller) has been living for the several years with the Englishwoman Jane Parker (Maureen O'Sullivan), but now Jane's former fiancé, Martin Arlington (Paul Cavanagh), comes to the jungle hoping to use her to find the legendary elephants' graveyard--and its fabled treasure of ivory. Arlington's arrogance and greed, however, lead to his gruesome death. Now, Tarzan races across the jungle, calling his friends, the elephants, for help to save Jane from the same grisly fate.