Abducted, Earthman David Stark is sent to the mines on an alien planet. After escaping and a brief time of happiness in the arms of the Golden Goddess and in the city under the ocean, he is captured again and sent to a planet of hot desert populated by ferocious predators.

Chosen by the Mindgods to liberate the Galaxy from the tyrant Kaloor, David Stark must change his body into a ferocious beast to emerge victorious from the last battle. His craving for blood during sexual intercourse in only part of his metamorphosis. He must fight bandits and slave traders to achieve the final goal.