Very hard to find movie featuring Blue Demon in his first starring role. The story involves the hero teaming up with a professor to challenge a mad scientist who turns himself into a werewolf.
Like the other early films Blue Demon made for producer Enrique Vergara (El Poder Satánico, Arañas infernales & La Sombra del Murciélago), El Demonio Azul was cheaply made but quite effective and has a creepier atmosphere than similar horror/lucha movies starring El Santo.
The Xvid is based on a VHS tape that is probably 2 or 3 generations away from the original recording. Quality is OK although night scenes are quite dark without much detail. In Spanish language only, no subtitles.