One of Santo's greatest matches was in 1952, when he fought a tag-team known as Los Hermanos Shadow (which consisted of famed luchadors Blue Demon and the Black Shadow). Santo beat and unmasked Black Shadow in the ring, which triggered Blue Demon's decision to become a técnico, as well as a legendary feud between Blue Demon and Santo that culminated in Santo's defeat in a well-publicized series of matches in 1952 and again in 1953. Although they appeared together in a number of action/adventure films, their rivalry never really ended in later years since Santo always remembered his defeat at Blue Demon's hands.