A trio of American adventurers marooned in rural Mexico are recruited by a beautiful woman to rescue her husband from Apaches.
After his brother Robeson disappears without a trace while exploring Africa in search of a legendary 'white tribe', Allan Quatermain decides to follow in his footsteps to learn what became of him. Soon after arriving, he discovers the Lost City of Gold, controlled by the evil lord Agon, and mined by his legions of white slaves.