Christmas vacation is the 3rd installment in the National Lampoon Vacation series. It's Christmas time and the Griswolds are preparing for a family seasonal celebration, but things never run smoothly for Clark (Chevy Chase), his wife Ellen (Beverly D'Angelo) and their two kids. Clark's continual bad luck is worsened by his obnoxious family guests, but he manages to keep going knowing that his Christmas bonus is due soon.