After the lord of darkness decides he will not cede his thrown 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.

Little Nicky, the son of the Tanner, a famous strongman, has made up his mind, that he can conquer the dragon as his father did long ago. Against prohibition of his father, Nicky has managed to get into trouble and now it depends only on his courage, whether he defeats the resurgent dragon and returns home from the magic world.