A brilliant and ambitious scientist, Steve March, along with his fiancée Sally, becomes entangled in an otherworldly crisis when a floating, disembodied alien brain with immense psychic powers, named Gor, takes control of Steve’s body. Gor, having escaped from a prison on his home planet Arous, is seeking to conquer Earth with his ability to control minds and manipulate atomic energy. Using Steve as his vessel, Gor begins to enact his plan for global domination, demonstrating terrifying abilities that subjugate the wills of others and pose a direct threat to national security.

The military and scientific communities are puzzled and alarmed by the sudden uptick in dangerous and inexplicable events. Steve's drastic change in behavior alerts Sally to the presence of a foreign entity. Sally seeks the help of another alien brain, Vol, who has pursued Gor to Earth in an effort to stop his malevolent mission. Vol, benevolent in nature and vulnerable without a human host, informs Sally of Gor's weakness and the dire situation facing the planet. Together, they must find a way to outwit Gor and liberate Steve from the alien's control before it's too late, understanding that the fate of the world rests on their ability to combat an enemy that is intangible, powerful, and not of this Earth.