Aliens from Outer Space are slowly switching places with real humans -- one of the first being a young man about to get married. Slowly, his new wife realizes something is wrong, and her suspicions are confirmed when her husband's odd behaviour begins to show up in other townspeople.
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| Crew | Al Peterson | Craft Service |
| Production | Bill Cunningham | Publicist |
| Costume & Make-Up | Hazel Hegarty | Costumer |
| Visual Effects | John P. Fulton | Visual Effects |
| Camera | Kenneth Meade | Camera Operator |
| Sound | Franz Waxman | Original Music Composer |
| Sound | Daniele Amfitheatrof | Original Music Composer |
| Sound | Ted Wasserman | Utility Sound |
| Sound | Leith Stevens | Original Music Composer |
| Costume & Make-Up | John Noble | Costumer |
| Camera | Paul Weddell | Assistant Camera |
| Sound | Jim Miller | Sound Recordist |
| Sound | Hugo Friedhofer | Original Music Composer |
| Sound | Philip Wisdom | Sound Recordist |
| Camera | Darrell Turnmire | Key Grip |
| Sound | Victor Young | Original Music Composer |
| Sound | Bob Simpson | Boom Operator |
| Camera | Mike Semenario | Grip |
| Directing | Dorothy Yutzi | Script Supervisor |
| Lighting | Joe Schuster | Best Boy Electric |
| Camera | Glen E. Richardson | Still Photographer |
| Sound | Charles Grenzbach | Sound Recordist |
| Art | Carl Coleman | Props |
| Art | Henry Bumstead | Art Direction |
| Art | Jim Cottrell | Props |
| Art | Hal Pereira | Art Direction |
| Production | Frank Caffey | Production Manager |
| Camera | Haskell B. Boggs | Director of Photography |
| Costume & Make-Up | Nellie Manley | Hair Supervisor |
| Directing | William Mull | Assistant Director |
| Production | Gene Fowler Jr. | Producer |
| Production | Bert McKay | Casting Director |
| Costume & Make-Up | Charles Gemora | Makeup Artist |
| Writing | Louis Vittes | Writer |
| Directing | Gene Fowler Jr. | Director |
| Art | Robert R. Benton | Set Decoration |
| Production | Curtis Mick | Assistant Production Manager |
| Production | Don Robb | Unit Production Manager |
| Costume & Make-Up | Wally Westmore | Makeup Supervisor |
| Directing | Bud Brill | Second Assistant Director |
| Costume & Make-Up | Dean Cole | Hairdresser |
| Art | Sam Comer | Set Decoration |
| Editing | George Tomasini | Editor |
