

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.
Practical Effects
Fog-drenched alien reveals still creepier than CGI.
Writing
Marge's slow-burn realization is genuinely tense.
Director
Gene Fowler Jr.
Trivia, insights & behind the scenes
Released same year as Invasion of the Body Snatchers, this film got buried and dismissed as 'just' a B-movie—now reclaimed as feminist parable about women not being believed.
Star Tom Tryon later became a bestselling horror novelist (The Other, Harvest Home) after quitting Hollywood—apparently aliens gave him career advice.
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