Now that Santa and Mrs. Claus have the North Pole running smoothly, the Counsel of Legendary Figures has called an emergency meeting on Christmas Eve! The evil Jack Frost has been making trouble, looking to take over the holiday! So he launches a plan to sabotage the toy factory and compel Scott to invoke the little-known Escape Clause and wish he'd never become Santa.
Phil Weston has been unathletic his entire life. In college he failed at every sport that he tried out for. It looks like his 10-year old son, Sam, is following in his footsteps. But when Phil's hyper-competitive dad benches Sam, Phil decides to transfer his son to a new team which needs a coach. Phil steps in to be the temporary coach and immediately begins to butt heads with this dad over this new competition in their lives.
Better watch out! The big guy in red is coming to town once again. This time, Scott Calvin -- also known as Santa Claus -- finds out there's an obscure clause in his contract requiring him to take on a wife. He has to leave the North Pole to fulfill his obligations, or else he'll be forced to give up his Yuletide gig.
On Christmas Eve, divorced dad Scott Calvin and his son discover Santa Claus has fallen off their roof. When Scott takes the reins of the magical sleigh, he finds he is now the new Santa, and must convince a world of disbelievers, including himself.