My Stepmother Is An Alien
(1988)
as Jessie Mills
Tagline: 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.
Plot: Widowed astronomer Steven Mills accidentally sends a great surge of energy out into space, threatening life on another world. They respond by dispatching one of their race disguised in deliberately attractive human form (Celeste) to Earth to sort things out, accompanied by a rather less attractive superior . Steven is indeed attracted, as is his untrustworthy brother, while Celeste becomes increasingly fond of Steven's young daughter (Alyson!).
Noteworthy Actors: Dan Aykroyd, Jon Lovitz, Seth Green
Other Noteworthy Actresses: Kim Basinger and Juliette Lewis