Kimberly Williams-Paisley

Kate Pierce is reluctantly spending Christmas with her mom’s new boyfriend and his son Jack. But when the North Pole and Christmas are threatened to be destroyed, Kate and Jack are unexpectedly pulled into a new adventure with Santa Claus.

Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave is going to propose to his new girlfriend in New York City - and dump them. They have three days to get to him and stop the proposal.