Risking to give away the secret of the North Pole, Scott Calvin, who is a part-time Santa Claus, invites his relatives to celebrate Christmas, along with the coming birth of his son Klaus, to whom his wife Carol is about to give birth. As a result, Scott, along with his large family and chief elf Curtis, is forced to confront the insidious villain Jack Frost, who intends to take away Christmas from Santa Claus and take over the North Pole...