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My Stepmother Is an Alien (1988)

PG-13 | | Comedy, Sci-Fi | 9 December 1988 (USA)
0:30 | Trailer

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A creature from another planet tries to seduce a shy Earth physicist to gain control over his researches. The result of this important mission much exceeded her expectations.


Richard Benjamin


Jerico Stone (as Jerico), Herschel Weingrod | 2 more credits »
4 nominations. See more awards »





Cast overview, first billed only:
Dan Aykroyd ... Steven Mills
Kim Basinger ... Celeste Martin
Jon Lovitz ... Ron Mills
Alyson Hannigan ... Jessie Mills
Joseph Maher ... Lucas Budlong
Seth Green ... Fred Glass
Ann Prentiss Ann Prentiss ... The Voice of Bag (voice)
Wesley Mann ... Grady
Tony Jay ... Council Chief
Peter Bromilow ... Second in Command
Nina Henderson Nina Henderson ... Cashier
Harry Shearer ... Carl Sagan (voice)
Adrian Sparks ... Dr. Morosini
Juliette Lewis ... Lexie
Tanya Fenmore Tanya Fenmore ... Ellen


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 <muzzle@cs.uq.oz.au>

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:

View content advisory »






Release Date:

9 December 1988 (USA) See more »

Also Known As:

Mi novia es una extraterrestre See more »


Box Office


$20,000,000 (estimated)

Gross USA:

See more on IMDbPro »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

1.85 : 1
See full technical specs »

Did You Know?


The Bag impersonates Carl Sagan in one scene. (The impersonation is done by Harry Shearer). Sagan was one of America's foremost astronomers and cosmologists. He also wrote the novel Contact, which was adapted into the film of the same name. See more »


When Celeste removes eggs from the pan, boiling water drips onto the glowing electric element, yet it doesn't hiss and steam. See more »


[after a long & strange make out, both somewhat out of breath]
Steven Mills: I've never felt anything like that before.
Celeste Martin: Do I now have to eat the chocolate from Pennsylvania?
Steven Mills: [laughs; looks slightly confused] What?
See more »

Crazy Credits

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


References Out on a Limb (1987) See more »


Room To Move
Written by Simon Climie, Rob Fisher and Dennis Morgan
Performed by Animotion
Courtesy of PolyGram Records, Inc.
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Frequently Asked Questions

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User Reviews

"Oh, Dr. Steve, that was sooo good."
9 March 2005 | by honkusSee all my reviews

This movie definitely falls under the "so bad it's funny" category. It is easily one of the most absurd Hollywood movies ever. Some of it almost feels like a Bugs Bunny cartoon starring SNL alums. The writer and director were either in the middle of a massive hallucinogen binge or had just gotten done watching like forty billion bad 1950s movies in a row.

Akroyd is mostly boring, but the look on his face when the ultra sexy Basinger puts the moves on him is priceless -- you can tell he's been in that situation before. The best acting in the movie probably comes from the dog, but as far as human actors go, Alyson Hannigan (the daughter) is an entertaining and refreshing break from the pouty, "my parents are so lame" cardboard cutouts found in most 80s and 90s comedies.

One of the funniest things I've ever seen comes at the party after the wedding. It lasts about a split second, but the band's keyboard player does the goofiest, most ridiculous 'pretending to make music' acting job ever.

Bottom line: the story and dialogue are so completely ludicrous that depending on how goofy a sense of humor you have, this will either be the worst or the funniest movie you'll ever see.

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