In 18th Century Spain, a small village, is ruled over by an evil Marquis. A beggar goes to the castle of this unfair ruler for some small amount of bread, and is humiliated and jailed. He is forgotten, and after a while becomes more animal than human, the only, contact he has with humanity is through the mute servant girl who feeds him. When the servant girl is thrown into the beggar's cell and raped in a fit of lustful rage she falls pregnant After being released from the cell she escapes the castle, and is taken in by the kind Alfredo Corledo. On Christmas Day, Leon is born. His mother dies at birth, and Corledo takes to raising the boy. Leon grows up a normal child until age 6, when he begins to go missing at night and the local sheppard's report losses among their flocks, Leon is a werewolf, a condition brought on by his traumatic heritage. However, with love and affection, the transformations can be fought, and they are, until Leon becomes a man. One full moon, he again turns into a werewolf and terrifies the town.