Santo vs The Riders Of Terror (1970)

aka: Santo Contra Los Jinetes Del Terror

A group of lepers escape from a western sanatorium and begin terrorizing a nearby town. A local creep offers the lepers food and water for their help in a series of robberies. Teaming up with a lawman to stop them is the one and only masked wrestler/crimefighter, El Santo. (In Spanish language, with English subtitles).