Luchador films are Mexican professional wrestling/action/science-fiction/horror films starring some of the most popular masked luchadores in Lucha Libre. The luchadores are portrayed as superheroes engaging in battles against a range of characters from spies, to vampires and Martians. These films were low-budget and produced quickly. Nearly all lucha films included fist-fighting and wrestling action sequences which were choreographed and performed by the stars without the aid of stunt doubles. The genre's popularity peaked during the mid-1960s to early-1970s. At least 150 luchador films were produced starting with the 1952 film Huracán Ramírez.
One of the most well-known Mexican luchador film stars was El Santo (Rodolfo Guzman Huerta) who starred in 52 films. Luis Enrique Vergara, the producer of the Santo movies and Mil Máscaras films, also created a Blue Demon series, similar to weekly comic book stories. Blue Demon starred in 25 lucha films. Vergara produced and at times wrote the scripts. He would cast beautiful, sensuous and well-built actresses into the movies, such as Altia Michel and Isela Vega as a foil to complement the masculinity of the super heroes.
In 1965, Santo walked out on producer Vergara over a contractual dispute, and Blue Demon suffered injuries and was thus unable to work. Vergara discovered Aaron Rodriguez, a young judo martial arts enthusiast, and offered him to star as Mil Máscaras. Máscaras was the first superhero/lucha libre personality created specifically for the movies, and he starred in 20 lucha films, including Enigma de muerte with John Carradine and Mil Mascaras vs. the Aztec Mummy with El Hijo del Santo, Blue Demon Jr, and Huracan Ramirez Jr.