This film is a rare example of Paul Naschy speaking with his own voice in a movie. In most of his roles, he was dubbed by professional dubbing actors.
Filmed in 1989, but never had a theatrical release and was premiered on TV in 1999. Supposedly registered in 1993, but copyright year doesn't appear in credits.
Marta Valverde recalled that when she proposed herself for this movie, Paul Naschy told her that she didn't fit the profile, because she looked like a good girl, since at that time she was about twenty years old or so. And determined to be bad, she showed up at the production company just as she was in the film: looking like a punk and junkie, and when Naschy saw her he said "the role is yours".