Five years before this movie was released, wrestler and actor Fernando Osés asked Santo to be in a movie with him. Santo had already turned down Rene Cardona’s El Enmascarado de Plata as he wanted to strictly be a wrestler and thought that the films would fail. Somehow, Oses was able to get the Mexican wrestling star to play his sidekick — Osés plays a masked cop named El Icognito — in this film and Santo contra Los Hombres Infernales. Of course, that wasn’t the title of either film as Santo was meant to just be the second banana. But after Santo contra Los Zombis became a success in 1962, both of these movies were rushed back out with Santo’s name in the title.
Strangely enough, both were filmed in Cuba with production ending literally the exact day before Fidel Castro entered Havana and declared that the revolution was a success. This seems like William Castle kayfabe BS, but who are we to deny Santo (or El Dandy, for that matter).
In the first fight of his film career, Santo loses to a trio of crooks who beat him down to the point that an evil doctor named Doctor Campos brainwashes the man in the silver mask and gets him to commit crimes. Luckily, El Icognito saves Santo, who is called El Enmascarado throughout the movie. By the end, Santo gets his revenge and El Icognito gets a bullet, even if he comes back for Santo contra Los Hombres Infernales.
This film does not fit into the crazed form of the later Santo films, but trust me, things will get much more interesting.
Also: Do not be confused with 1961’s Santo vs. the Diabolical Brain.