This movie reveals the incredible, never-before seen answer to every child's question: "So how does Santa deliver all those presents in one night?" The answer: Santa's (Jim Broadbent's) exhilarating, ultra-high-tech operation hidden beneath the North Pole. But at the center of this movie is a story about a family in a state of comic dysfunction and an unlikely hero, Arthur (James McAvoy), with an urgent mission that must be completed before Christmas morning dawns..