The children who live on Mars are suffering a strange depression. The wise man who advises the Martian leaders diagnoses a lack of 'Santa Claus' visitation in the kids annual itinerary. To this end an invasion of Earth is planned such that the Martians can bring Santa back to Mars to work his child-friendly magic, and thus cheer up the children. But when they touch down on Earth little goes as planned and much to the Martians' confusion they find a Santa in every store. By kidnapping two Earth children the Martians deduce that the North Pole should be their true destination. Santa is persuaded to build a toy factory on Mars staffed by robots rather than elves, but can Santa and the two children make it back to Earth in time for the real Christmas?