After the lord of darkness decides he will not cede his throne to any of his three sons, the two most powerful of them escape to Earth to create a kingdom for themselves. This action closes the portal filtering sinful souls to Hell and causes Satan to wither away. He must send his most weak but beloved son, Little Nicky, to Earth to return his brothers to Hell.
On 28 December 1999, the citizens of New York City are getting ready for the turn of the millennium. However, Satan decides to crash the party by coming to the city and searching for his chosen bride — a 20-year-old woman named Christine York. The world will end, and the only hope lies within an atheist named Jericho Cane.
During a rainy day, and while their mother is out, Conrad and Sally, and their pet fish, are visited by the mischievous Cat in the Hat. Fun soon turns to mayhem, and the siblings must figure out how to rid themselves of the maniacal Cat.
