It's a sure bet for comical calamity when Clark (Chevy Chase), Ellen (Beverly D'Angelo), Audrey, and Rusty pack up the car and head for the neon lights of Las Vegas. Once there, the Griswold kids get mixed up with mobsters and go-go dancers, Ellen is wooed by Wayne Newton, and Clark winds up on stage with Siegfried and Roy. Marisol Nichols, Ethan Embry, Randy Quaid, Miriam Flynn also star. 95 min. Widescreen (Enhanced); Soundtracks: English Dolby Digital 5.1, French Dolby Digital 5.1; Subtitles: English, French, Spanish; theatrical trailer.