It has now become a film-review clich to preface a write-up for I Married a Monster From Outer Space with the cautionary "Don't be misled by the title." The fact remains, however, that this one of the better and more intelligent horror outings of the late 1950s. The "I" of the title is Marge Farrell (Gloria Talbott), who can't help noticing that her husband Bill (Tom Tryon) has been acting very strangely since their dark-and-stormy wedding night. For one thing, the formerly demonstrative Bill behaves listlessly, as though possessing no emotions whatsoever; for another, though he spends much of his free time at Grady's Bar, Bill never takes a drink (now that is weird!) It isn't long before Marge discovers that Bill, along with several of his male friends, have been taken over by aliens from the Andromeda Nebula, who have arrived on earth to replenish their species. There's only one flaw to this plan: the aliens are unable to procreate! Once the authorities are alerted, a posse of non-possessed men attack the alien spaceship, paving the way for the not-altogether-predictable finale.
~ Hal Erickson, All Movie Guide