The first man into space is killed during his re-entry to Earth's atmosphere. Scientists sent to investigate the wreckage discover evidence of an extraterrestrial stowaway alongside the astronaut's corpse. This insidious force from outer space reanimates the dead man's body, using it as a breeding ground for alien embryos. The horrified scientists take refuge in a remote research station while the blood beast picks them off one by one. In a fiery, other-worldly climax the monster reveals his intentions in a dramatic confrontation between the space invader and the forces of Earth.