I Married a Monster from Outer Space (1958)

I Married a Monster from Outer Space is a 1958 science fiction film, directed by Gene Fowler Jr. and starring Tom Tryon and Gloria Talbott. The story centers on freshly married Marge Farrell who finds her husband Bill strangely transformed soon after her marriage: He is losing his affection for his wife and other living beings and drops various earlier habits. Soon she finds out that Bill is not the only man in town changing into a completely different person.
Soon after her marriage, young bride Marge Farrell notices her husband Bill is acting strangely. He doesn't show any affection towards his wife or other living beings, including pet dogs which he used to love. Marge also becomes concerned that she cannot get pregnant. She then notices that the husbands among her social connections are acting the same way. One night she follows Bill when he goes for a walk and finds that he's not the man she knew but an alien impostor: An extraterrestrial lifeform deserts his human body and enters a hidden spaceship. Bill eventually explains to her that all the females from his planet were killed and that he and his kind are taking over human males so that they can mate with women and save his race. Marge is horrified and tries to warn others of the plot, but too many men have already been taken over, including the Chief of Police. Finally she finds that her doctor believes her, who summons a posse to attack the aliens in their hideout. Although gun bullets can't hurt the invaders, they are defenceless against the pair of German shepherds that the men bring with them, and are finally killed. In the spaceship, the men find the human captives alive, including Bill. An army of spaceships lifts off around the world, seeking a new refuge.

I MARRIED A MONSTER FROM OUTER SPACE
GENE FOWLER JR  (1958)
PARAMOUNT PICTURES
78 MIN
USA