Governor Bronson, who raised Bob Wayne from childhood after the death of his parents, is killed at the hands of a world-domination-seeking 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. Bob's 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 guardian's death, Wayne decides to adopt his father's 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.