An original 1970 Egyptian movie poster for Santo contra Blue Demon en la Atlántida - Santo v's Blue Demon in Atlantis, a Mexican film directed by Julián Soler. 
Santo is a phenomenom in Mexico, creating a whole genre around the luche libra (Mexican Wrestler) concept. He's the equal of Batman, a scientific genius who is also a millionaire playboy who the cops rely on to solve all manner of cases but he also wrestles and unlike Bruce Wayne.
In this film a Nazi scientist is using the lost city of Atlantis as his home base to threaten destruction of civilization with a nuclear bomb.  Santo is enlisted to find the nuclear bomb, disarm it and end the Nazi scientist's diabolical plan. Amazing!