My Stepmother Is an Alien (1988)

PG-13  |   |  Comedy, Sci-Fi  |  9 December 1988 (USA)
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Reviews: 53 user | 15 critic

An alien is sent on a secret mission to Earth, where she appears as a gorgeous, attractive, and single lady. Her mission is to make contact with a rather nerdy young scientist, who's quite ... See full summary »


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Cast overview, first billed only:
Ann Prentiss ...
The Voice of Bag (voice)
Council Chief
Peter Bromilow ...
Second in Command
Nina Henderson ...
Carl Sagan (voice)
Dr. Morosini
Tanya Fenmore ...


An alien is sent on a secret mission to Earth, where she appears as a gorgeous, attractive, and single lady. Her mission is to make contact with a rather nerdy young scientist, who's quite overwhelmed by her attentions, and isn't aware of the connection between her arrival and his work. Written by Murray Chapman <>

Plot Summary | Add Synopsis


A million lightyears from home, she's found a husband, a stepdaughter and a dog. When she finds out about sex, she may just stay for weekend. See more »


Comedy | Sci-Fi


PG-13 | See all certifications »

Parents Guide:





Release Date:

9 December 1988 (USA)  »

Also Known As:

Mi novia es una extraterrestre  »

Filming Locations:


Box Office


$20,000,000 (estimated)


$13,854,000 (USA)

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.85 : 1
See  »

Did You Know?


Kim Basinger turned down the chance to play Sarah Tobias in The Accused (1988), in order to play Celeste. See more »


When Celeste is at the party in the red dress her hair is completely straight. She then changes clothes in the back of Steve's car, and when she get out her hair is curly. See more »


[after Steve asks if she wants to have sex]
Celeste Martin: Sure. I just have to figure out what that is.
See more »

Crazy Credits

After all the credits roll, Jimmy Durante rather, his ghost] says "Goodnight Mrs. Calabash, whereever you are" See more »


References Poltergeist (1982) See more »


Hot Wives
Written by Peter Aykroyd
Performed by Dan Aykroyd and Kim Basinger
Produced by John Boylan
See more »

Frequently Asked Questions

See more (Spoiler Alert!) »

User Reviews

Still delivers big laughs, one to watch when your world has some gray skies
29 May 2008 | by (Toledo, Ohio) – See all my reviews

Widower Dr. Steve Mills (Dan Ackroyd) is a two-bit astronomer who wants desperately to send a light beam "out of" the solar system. He fervently believes there is life on other planets but his experiments have been known to damage expensive equipment. Therefore, his boss has told Steve that he will get the boot if he breaks anything else. Needing lightning to bolster his beam, Dr. Steve begins his next attempt at intergalactic communication in a thunderstorm when the system suddenly gets a "superboost" of power, which he can't explain. The result is that the radar shows his light went into another GALAXY, hurrah, but, soon after, the entire system goes south. Steve gets thrown out on his ear, of course. He goes home to his thirteen year old daughter, Jessie (Alyson Hannigan) and contemplates his next move. His womanizing brother, Ron (Jon Lovitz, absolutely hilarious) throws a party to cheer him up, too. But, crashing the get-together, is a beautiful blonde, Celeste (Kim Basinger) who flirts with Steve and wants to know his science secrets. That's because she is an alien whose planet was damaged by Dr. Mills' light beam. She has only a short time to get the good astronomer to send the jolt again so that her world will be saved. But, naturally, Steve must not know she is not an earthling. From alien "eyes" in handbags to drinking car batteries to convincing Steve to marry her, will Celeste succeed in her rescue attempts? If you are world weary, I heartily recommend this old charmer. It is very funny, probably Richard Benjamin's best effort, and it has a terrific cast, too. Ackroyd is wonderful but, then, so is Basinger in a role for which she has probably never garnered any praise, which is a big shame, for she is very funny and sweet. As for Lovitz, he could make a stone laugh and he is in excellent form in this one. All of the other cast members, including Hannigan, in her first big role, are fine. There is an abundance of terrific sight gags and special effects and the script is humorous, polished, and offbeat. As for the costumes, they are impressive, with Basinger looking like a dream. In short, do not be an alien to this film. There have been many films in cinematic history which have been praised high above this one but there are very few that actually deliver the laughs and enjoyment of this truly winning flick.

12 of 14 people found this review helpful.  Was this review helpful to you?

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