Santo vs. the Diabolical Brain

Investigators Conrado and Fernando take a leave of the absence from the police force to track down Fernando's girlfriend Virginia. Virginia, a reporter, has left town and is working undercover as a barmaid in order to interview Refugio Canales, a criminal and small town municipal president. Conrado and Fernando soon call their friend Santo for help.

• Director: Federico Curiel
• Cast: El Santo, Ana Bertha Lepe, Roberto Ramírez Garza, Celia Viveros, Fernando Casanova