 After the lord of darkness decides he will not cede his underworld thrown to any of his three sons, the two most powerful of the three escape to Earth to create a kingdom for themselves there. This action closes the portal filtering sinful souls to Hell and causes Satan to begin withering away. He must send his most weak but beloved son, Little Nicky, to Earth to return his brothers to Hell. Can Nicky learn his way around Earth and round up his brothers in time to save Satan?