A few days spent in close proximity to each other soon leads to family secrets and old resentments being revealed, which threaten to splinter an already dysfunctional family.
After a Black Friday riot ends in tragedy, a mysterious Thanksgiving-inspired killer terrorizes Plymouth, Massachusetts - the birthplace of the infamous holiday.
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.