A troubled and irresponsible man named Nick Wrigley is hacked by criminals who are looking for a bank account code to Nick's boss. The criminals Bill and Harry manage to find his apartment and start berating him for the Internet scam he has pulled on them. They tell him they want their money by Christmas or else they will have their enforcer Eliot beat him up. Bill and Harry leave and Nick decides to run away. Nick is leaving the building when Eliot sees him leaving and chases him. Nick manages to escape when he runs to a North Pole stage where kids meet Santa Claus. He steals the costume for Santa Claus and walks to the bus stop in disguise and goes to his brother's house. Meanwhile, the house's mischievous 14-year-old Danny Wrigley welcomes his uncle because he has a better relationship with him than any other person in his family. Danny's father however is less than thrilled to see his older brother, while his wife welcomes Nick. Danny's parents, both doctors, are called into the hospital and reluctantly leave Nick to look after their three children. After receiving a threatening e-mail from Bill and Harry that they are currently tracking him down to get the money out of him, Nick ends up having to unleash a virus to throw them off his trail. On Christmas Eve, Santa comes to the house with a device that can freeze time, in order to put the family's presents under the tree unnoticed. An object hits the device, time goes back to normal, and Nick hits him unconscious. They decide to deliver Santa's presents. While Nick is delivering the presents, unbeknown to Danny he is stealing from the houses. When Danny finds out that Nick is stealing he feels betrayed and goes back home in Santa's sleigh. Meanwhile, Danny's younger siblings, Kaitlyn and Peter find an unconscious Santa on the floor of their living room. He wakes up and convinces them that he is Santa. They find out that Danny and Nick have stolen the sleigh and presents and Santa says that Danny will be on the naughty list forever. When Danny comes back he apologizes to Santa, but the sleigh is broken. Nick is sitting at a bus stop when he sees Bill, Harry, and Eliot. They ask him where the address to his brother's house is as they don't recognize him because he is wearing a Santa costume. Nick doesn't answer them and they drive off. Nick realizes a second later they are going to his brother's house, which means that his family is in trouble. Nick, who still has Santa's device, races back to the house and get there just in time. He saves his family from the men using the device to shrink Eliot. This causes Bill, Harry, and Eliot to drive away terrified. Nick returns the device to Santa and then gives Santa his beloved laptop to fix Santa's sleigh and save Christmas. The next morning, Nick wakes up and sees Santa has given him the guitar that he has wanted since childhood, but never got for Christmas because he was on the naughty list. He agrees to sell the guitar to pay off his debts but entertains the family by playing it first.
