His best-known movie outside of Mexico is also considered one of his best, 1962's "Santo vs. las Mujeres Vampiro" ("Santo vs. the Vampire Women"), which was also featured in an episode of "Mystery Science Theater 3000". In this movie, the production values were better, and there was an attempt at creating more of a mythos and background for Santo, as the last of a long line of superheroes. It was an enormous success at the box office. Only four of the 52 Santo films were ever dubbed into English, the other 48 being only available in Spanish. The English-dubbed Mexican films of that time period were imported to the United States through the efforts of K. Gordon Murray who changed the name of Santo to "Samson" for some of his releases. Most of Murray's imported Mexi-films went directly to late-night American TV. Santo's most financially successful film was "The Mummies of Guanajuato" (1970), which co-starred Blue Demon and Mil Mascaras.