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.
Tom Tryon
as Bill Farrell
Gloria Talbott
as Marge Bradley Farrell
Alan Dexter
as Sam Benson
Jean Carson
as Helen Rhodes
Ken Lynch
as Dr. Wayne
Maxie Rosenbloom
as Max Grady - Bartender
Peter Baldwin
as Officer Hank Swanson
Jack Orrison
as Officer Schultz
John Eldredge
as Police Capt. H.B. Collins
Robert Ivers
as Harry Phillips
Chuck Wassil
as Ted Hanks
Ty Hardin
as Mac Brody (as Ty Hungerford)
