My Stepmother Is an Alien is a failed attempt to mix many of the film genres associated with the ‘alien’ idea into a sprightly romp.
Dan Aykroyd, as a rumpled, overweight, widower scientist, foils one of his own experiments using lightning and a high-powered satellite dish which results in a signal reaching beyond our galaxy to a planet in peril.
Soon afterwards, a flying saucer lands on a Southern California beach and two aliens alight. They come in the form of quintessential American beauty Kim Basinger in a slinky red sheath dress with an alien-buddy-mentor (the snake, voice courtesy of Ann Prentiss) hiding in her purse.
Their mission is to get Aykroyd to repeat his experiment, which will save their planet.
It is the lengths to which Basinger is expected to go wending her way into Aykroyd’s otherwise nerdy suburban lifestyle that is supposed to levitate this fish-out-of-water story to comedic heights.