When Santa sets off on his Christmas duties a day early, crashes into the Fox family's house, ends up with amnesia and loses his magic sack of presents, he needs help! But the Fox family are a modern and broken family. Can they help him? The parents are preoccupied with work and the kids aren't very festive. But it's up to them to help Santa find his magical bag of toys and the clock is ticking or Christmas will be ruined. Forced to set their own problems aside and work together the Fox family...

Divorcee Scott Calvin is disgusted to learn that his ex and her husband have tried - and failed - to break it easy to their 6-year-old son Charlie that Santa isn't real. On Christmas Eve, Scott reads The Night Before Christmas... then receives an unexpected visitor on his roof. When he's startled by Scott's calling out and falls, the Santa impersonator disappears, leaving only an 8-reindeer sleigh and a suit with instructions to put it on if he's involved in an accident. Scott does, and is...