Chevy Chase and Beverly D'Angelo reprise their roles as heads of the Griswold clan, whose fourth adventure takes them to Las Vegas. Eddie: Randy Quaid. Rusty: Ethan Embry. Audrey: Marisol Nichols. Wayne Newton and Christie Brinkley have cameos.
A family host their dysfunctional relatives for the holiday as the dad contends with spontaneously combusting Christmas lights and temperamental trees while anticipating the arrival of his annual bonus.