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.

• Paramount Pictures
• Tom Tryon
• Gloria Talbott
• Alan Dexter
• Jean Carson
• Ken Lynch
• Maxie Rosenbloom
• Peter Baldwin
• Jack Orrison