A family of aliens on a dying desert planet search for subterranean water to drink through a straw. A NASA research probe lands and begins taking atmospheric samples via a suction device. The aliens are accidentally sucked into the apparatus and the probe returns to Earth. The aliens escape from a government base with their ability to manipulate electricity and destroy anything they touch. While three of them run off into the desert, the smallest one breaks away and hides in a passing minivan occupied by single mother Janet Cruise and her two sons (younger son Eric, who uses a wheelchair, and elder son Michael) who are moving to a new home near Los Angeles following the loss of her husband. Shortly after the move, a series of strange incidents causes Eric to suspect the alien's presence. The next morning, he finds that it has trashed most of the new house and sees the creature face-to-face for the first time, but Janet blames both him and Michael for what has happened. After noticing the alien outside, Eric tries to catch up to him, but ends up rolling down a hill in his wheelchair and falls into a lake, where he nearly drowns, but is rescued by the alien. He is not believed at all when he tries to tell Janet and Michael about its actions.