Wayne and Lanny, now partners, are called by Magee to meet with a secret contact - Mrs. Claus, who sends them on a new mission to retrieve a box from Santa's secret workshop. Later they sneak into Santa's office while he is asleep, using their high tech equipment from the previous film. Lanny's expertise at dressing the tree enables them to enter the hidden workshop where they recover the box and escape just in time. But what is the box for?