An alien race, with plans for conquering Earth, creates a pre-invasion force of cyborgs - all modeled in the likeness of the son of a famous scientist, who died in a plane crash. One of the inhuman impersonators (Lemoine) sets out to steal the formula for a new paralyzing gas, which has been created by one of Earth's great scientists. While the ladies of the city find him quite irresistible, the cyborg is determined to complete his mission, and will not hesitate to destroy anyone who stands in his way!