Accompanied by their children (Dana Barron, Anthony Michael Hall), Clark Griswold (Chevy Chase) and his wife, Ellen (Beverly D'Angelo), are driving from Illinois to a California amusement park. As Clark increasingly fixates on a beautiful woman driving a sports car, the Griswolds deal with car problems and the death of a family member. They reach Los Angeles, but, when Clark worries that the trip is being derailed again, he acts impulsively to get his family to the park.