Based on the case of serial killer Manuel Blanco Romasanta who murdered at least 13 people in 1850s Spain. He claimed a curse turned him into a wolf causing him to kill. Because of these claims, Queen Isabella II acquitted him, but he died in jail before being released. The Romasanta case previously inspired Carlos Martínez-Barbeito's novel "El bosque de ancines", filmed as The Ancines Woods (1970).
Fantastic Factory's sixth production after Faust (2000), Dagon (2001), Arachnid (2001), Darkness (2002) and Beyond Re-Animator (2003). It was followed by Rottweiler (2004), The Nun (2005) and Beneath Still Waters (2005). Fantastic Factory closed in 2005 after to fail in its attempt to create the first Spanish cinema company specialized in genre movies.
Ivana Baquero's debut.