Every 163 years, the time comes to find a new Santa Claus for according to the rules, he has to retire after 178 years of good and loyal service. Fifteen years before he leaves, the Christmas elves go out to find the ideal replacement: an orphan called Nicolas, who has a good and pure heart. This is how Nicolas Barnsworth arrives at the North Pole from Australia. He has 15 years to get used to and learn the tricks of the "Santa Claus" trade: learning how to get down the chimney flues, driving the sleigh. Old Santa proves to be a wonderful teacher, and Nicolas will get to share quite funny experiences with Humphrey the chief elf, Randolph the reindeer and Rufus the little polar bear.