In 13th-Century China, the invading Mongol leader Garak (Leopoldo Severini) decides to kill a young prince before he can take the throne, staging a hunting accident to explain the death. The nomadic strongman Maciste (Gordon Scott) saves the prince from a tiger pit and brings him to a monastery, then attempts seven feats of strength which will repel the invaders according to prophecy. During one of Maciste's tests, he is captured and imprisoned beneath the Mongol palace. As rebellion swirls around Garach, Maciste summons all of his strength and breaks free, causing a spectacular earthquake which swallows the invading hordes. This standard sword-and-sandal adventure features some rousing battle scenes, but was so heavily edited for American release that only five of Maciste's seven tests remain.