Santa(Tim Allen)'s got problems: it's a few days before Christmas and production lags, Mrs. Claus(Elizabeth Mitchell) is about to give birth to their first child and wants family time, and Jack Frost(Martin Short) (tired of second billing) is on probation under his supervision. He tries to support his wife by bringing her parents to the North Pole (to preserve his secret, they must think it's Canada). He also brings his ex-wife Laura(Wendy Crewson), her husband Neil(Judge Reinhold), and their daughter Lucy(Liliana Mumy). Inside the toy factory, Jack makes mischief and hatches a plan to become Santa. With Santa juggling that many snow globes, something is bound to go wrong. But if things get too difficult, he can always exercise his option to invoke the Escape Clause. Will he?