Alejandro Muñoz Moreno became better known as Blue Demon, a Mexican luchador and film actor who was the contemporary, teammate and often rival of El Santo. From 1948 to 1989, he never lost his trademark mask in a series of mask vs. mask and mask vs. hair challenges, winning the hoods of Espectro II, Matemático, Rayo de Jalisco and Moloch and shaved the heads of Baby Olson, Tony Borne and Cavernario Galindo. He held the NWA World Welterweight Championship twice, the Mexican National Welterweight Championship three times and the Mexican National Tag Team Championship. He was such a big deal that each year or so, CMLL holds the Leyenda de Azul tournament in his name and he was buried in his trademark outfit.
Along the way, he found the time and energy to appear in 28 movies.
After La Furia del Ring and Asesinos de la Lucha Libre, this was the third film that Blue Demon would appear in. Directed by Chano Urueta, this is a great introduction to the hero, who battles werewolves and mad scientists. Whereas El Santo at least had a silver mask that you'd figure would give him the edge against el hombre lobos, Demon has no such extra advantage. Instead, he's going to battle them with just the gifts that God gave him, which is mostly body slams, which somehow do end up curing the world of lycanthropes in this entry.
One of the wrestlers that Blue Demon is in the ring with in this, Ray Mendoza, may not be known as much to American audiences, but his sons became Los Villanos and two of them - Villano 4 and Villano 5 - wrestled for WCW.
Plus, the man who played El Sanguinario in this - Fernando Osés - would go on to write ten of the Santo films and nearly all of Blue Demon's movies, including this one. He even directed three movies - El Chicano Justiciero, La Hija del Contrabando and Gente Violenta.
Review by BandSAboutMovies from the Internet Movie Database.