The William family lived alone in the heart of the Southern California desert, and except for their house, there was a desolation around them. The granddaughter of William Sr. (Jim Davis Jim Davis) finds a strange white object glowing green at the back of the house. She firmly believed that it was an alien and called her grandfather and mother to watch, but they didn't see anything. After Grandpa left, the little girl saw the "monster" again, and this time it became even smaller. The girl put it in her pocket and took it into the bedroom. Late at night, the "monster" turned into a green villain and played a joke with the little girl. But another group of aliens unexpectedly brought William's house into the space-time tunnel and sent it to the dinosaur-infested prehistoric world.