Steve Urkel, après un malheureux accident où il ridiculise le Père Noël du centre commercial, crée une invention dans l'espoir de réparer l'esprit des Fêtes avec l'aide du vrai Père Noël. The holiday season has arrived, and brilliant but accident-prone Steve Urkel has already ruined his local celebration by publicly humiliating a shopping mall Santa. In his attempt to make things right and score some nice points with the big guy in the North Pole, Steve creates an invention that only makes things worse. Using his big brain and even bigger heart, Steve must find the real Santa to see if together they can help the city rediscover the holiday spirit.