A doctor returns to his small-town practice but finds many of the townspeople convinced that their friends and family are imposters.  Gradually, it becomes apparent that a sinister force is at work.  Classic 1950s science fiction in which the monster is not some mythical beast but reflects our new fears about space aliens and losing our own identity.  Starring Kevin McCarthy, Dana Wynter, Larry Gates, King Donovan, Carolyn Jones and Jean Willes. Directed by Don Siegel. 

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