It may not have come out under the National Lampoon banner but you'll recognize both the characters and the situations. The innocent Griswold clan head from their Chicago home to the bright lights and gambling temptations of Las Vegas. Clark (Chase) blows all their money, Ellen (D'Angelo) reveals a hidden passion for Wayne Newton, daughter Audrey (Nichols) decides to become a go-go dancer, and son Rusty (Embry) turns into a high roller who draws the attention of the mob. Oh yeah, dimwit cousin Eddie (Quaid) also tries to supply a few yucks.