Mysterious Doctor Satan

Mysterious Doctor Satan is a 1940 film serial named after its chief villain. Doctor Satans main opponent is masked mystery man The Copperhead, whose secret identity is Bob Wayne, a man searching for justice and revenge on Satan for the death of his stepfather. The serial charts the conflict between the two as Bob Wayne pursues Doctor Satan, while the latter completes his plans for world domination.

Governor Bronson, who raised Wayne from childhood after the death of his parents, is killed at the hands of a worlddominationseeking mad scientist called Doctor Satan. Fearing his death might be at hand, as it has been for everyone else who had opposed the Doctor, the Governor first confides in Wayne with a secret about his past. Bobs father was really an outlaw in the Old West, who fought injustice while wearing a chainmail cowl and leaving small coiled copper snakes as his calling card.Following his guardians death, Wayne decides to adopt his fathers Copperhead persona and cowl. Doctor Satan, meanwhile, requires only a remote control device invented by Professor Scott to complete his army of killer robots and gain all the power and riches he desires. ........

Source: Wikipedia