All Mitch Snider wants for his family is a traditional holiday feast with the relatives. The problem is that he doesn't have any. That is until he gets an invitation in the mail from his long-lost cousin Woodrow. What follows is a full-course meal of nonstop laughs when the neurotic suburbanites clash with the hippy hicks from hell in National Lampoon's most outrageous family misadventure yet.

One man's struggle to contain the curse he hides within... and his last-ditch attempt to free himself with the love of family. But when it looks as if he is losing his battle, and endangering all he holds most dear, the family dog, Thor, is the last hope for his family's survival... and the end to his Werewolf curse.