My Stepmother Is An Alien - Plot

Plot

Celeste (Kim Basinger) is an alien sent on a secret mission to Earth; Steven Mills (Dan Aykroyd) is a widowed scientist who is working on experimental ways to send radio waves into deep space. An accident causes a loss of gravity on Celeste's home world. She's sent to investigate who could affect gravity and how it was done under the belief it was an attack. She's aided by an alien device resembling a tentacle with an eye, which hides in a designer purse to aid Celeste with her encounters on Earth. The Bag is able to create any object, such as diamonds and designer dresses almost instantaneously.

Celeste's inexperience leads to her almost exposing herself as alien, like trying to kiss for the first time or cooking. Jessie Mills (Alyson Hannigan), Steven's 13 year old daughter, notices Celeste's strange habits, like eating cigarette butts and flashlight batteries or pulling hard boiled eggs out of boiling hot water with her bare hands. However, she can't convince her smitten father that there is something unusual about Celeste.

Celeste encounters a lot of new experiences such as sneezing, sexual intercourse and love. Eventually, Celeste falls in love with Steven and likes his daughter. She attempts to convince her home world that the attack was actually an accident and that Earth shouldn't be destroyed.