Celeste (Kim Basinger) is an extraterrestrial life sent on a secret mission to Earth, and Steven Mills (Dan Aykroyd) is a widowed scientist who is working on different ways to send radio waves into deep space. Steven accidentally sends a radio wave out of the galaxy to Celeste's home world (Cosine N to the 8th) which causes a disruption of gravity on her planet. She is sent to investigate who could affect gravity and how it was done, believing that it was an attack. She is aided by an alien device (called Bag) resembling a tentacle with an eye, which hides in a It Bag to aid Celeste with her encounters on Earth. Bag is able to create any object, such as diamonds and Designer clothinges almost instantaneously. Celeste crashes a party hosted by Steven's brother Ron (Jon Lovitz), where she immediately draws attention to herself by making dated references to old TV shows and political slogans under the mistaken belief that it was current (her superiors had just collected the information, which had taken 92 years to get from Earth to her home world).