5.4 0Add to favorites 0Add to Watchlist 0Add as SeenMy Stepmother is an Alien(Dec. 09, 1988) Dec. 09, 1988 5.4 My Stepmother is an Alien IMDb: 5.4 1988 108 min 477 views Trying to rescue her home planet from destruction, a gorgeous extraterrestrial named Celeste arrives on Earth and begins her scientific research. ... ComedyScience Fiction