After a devastating nuclear war, Earth has become a hostile wasteland. A survivor returns from space and embarks on a perilous quest for a legendary underground refuge. There, water is said to flow, and a new life is supposedly possible. But what awaits him is a nightmarish regime under the power-hungry despot Kragg, who enslaves women for reproduction. To save a mysterious beauty, the lone survivor confronts the brutal ruler in a final, desperate battle.