To save his declining business, Chris Cringle (Mel Gibson), also known as Santa Claus, is forced into a partnership with the U.S. military. Making matters worse, Chris gets locked into a deadly battle of wits against a highly skilled assassin (Walton Goggins), hired by a precocious 12-year-old after receiving a lump of coal in his stocking. 'Tis the season for Fatman to get even, in the action-comedy that keeps on giving.