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Frank Douglas (Henry Hite) is an astronaut whose spacecraft disappears while returning to Earth. Col. Steve Connors (Phil Morton) and his team of military men go looking for Douglas, only to stumble across the first in a series of mysterious deaths. Connors and company soon come to suspect that Douglas has been transformed into a murderous monster. As space program experts hypothesize about what happened to Douglas, Connors tries to prevent further mayhem. Wikipedia