Scott Calvin, a 37-year-old marketing director for a toy company based in Lakeside,
Illinois and divorced father, prepares to spend
Christmas Eve with his young son, eight-year-old Charlie. He wants Charlie to maintain his belief in
Santa Claus, even though he does not believe in him. Scott's ex-wife, Laura, and her psychiatrist husband, Dr. Neil Miller, stopped believing in Santa at a young age and feel it is time for Charlie to do the same. Scott and Charlie are awakened that night by a noise on the roof. While investigating, Scott startles
Santa Claus, who falls off the roof and is believed to be dead. Santa's body vanishes, leaving behind his familiar suit and a business card instructing the reader to wear his suit should anything unfortunate happen to him, and the
reindeer will respond accordingly. Scott and Charlie find Santa's sleigh and reindeer on the roof. At Charlie's request, Scott reluctantly dons the suit and delivers gifts before the reindeer take them to the
North Pole. The father learns that, by wearing the suit, he is subject to a legal technicality known as "the Santa Clause," and has accepted all of the late Santa's duties and responsibilities. Head elf Bernard gives Scott eleven months to get his affairs in order before reporting back to the North Pole on
Thanksgiving. Overwhelmed, he changes into the pajamas provided to him and falls asleep. The next morning, Scott awakens in his own bed, believing the previous events were a dream, but realizes he is still wearing the pajamas he was given. Charlie is proud that his father is the new Santa Claus, which arouses concern among Laura, Neil, and the school staff. Scott, not wanting to destroy Charlie's newfound enthusiasm, asks him to keep their North Pole trip a secret. Over the next year, Scott begins to take on Santa's appearance and habits. He develops a ravenous appetite for sweets, primarily milk and cookies despite previously being lactose intolerant. The taste for these newfound treats cause Scott to gain an inordinate amount of weight seemingly overnight and he balloons to 192lbs, which at first he thinks he is just bloated. He grows a white beard that instantly regrows after shaving, and his hair turns white no matter how much he dyes it. Scott's doctor says his weight gain is just fluctuation, even when Scott insists that gaining 45lbs in a week is not right. During a meeting with his company, Scott argues against a proposal to advertise a toy military tank by showing Santa riding it, insisting that he must use his sleigh. Scott's boss Mr. Whittle takes him aside and asks him to get some help. He also begins to recount, by name, "naughty" and "nice" children he sees. After Laura and Neil witness children wanting to sit on Scott's lap at Charlie's soccer game, they assume Scott is deliberately misleading Charlie, so they get Scott's visitation rights suspended. On Thanksgiving, a distraught Scott goes to Laura and Neil's house to see Charlie one last time. The boy, desperate to help him realize how important he is to the children of the world, shows him a magical snow globe (a gift from Bernard), convincing him that he really is Santa. When Laura and Neil allow the two a minute to talk alone, Bernard appears and transports father and son to the North Pole. Thinking Scott has kidnapped Charlie, Laura and Neil summon the police. Scott sets out to deliver gifts with Charlie in tow. Upon arriving at Laura and Neil’s home, he is arrested inside the house while Charlie waits for him in the sleigh. The elves eventually break him out of jail. When Scott returns Charlie to his house, he insists that he spend Christmas Eve with Laura and Neil. His heartfelt speech to Charlie about the importance of everyone in the family convinces Laura and Neil that he is Santa. Laura burns the court documents suspending Scott's visitation rights, and tells him he can visit anytime. According to Bernard, any time Charlie shakes his snow globe, his father will appear. Before leaving, Scott gives Laura and Neil the two presents they never received as children, which led to their disbelief in Santa. Scott's takeoff from the roof proves his identity to the police and various witnesses outside the house. After Scott leaves, Charlie summons him back with the snow globe. So, Laura agrees to let them go together in the sleigh to finish delivering the presents. ==Cast==