In this republic serial,a mad doctor called doctor satan(edward cianelli) plot’s to dominate the world with an army of huge robots!,but only one man can stop this mad plot,the copperhead(robert wilcox(david sharp as the copperhead stunt double)!.when a governer is murdered,the copperhead protects a scientist(c. montague shaw) and his daughter(ella neal) as doctor satan attempts to obtain the scientist’s remote control invention to use to operate his monstrous robot!,this is a great example of a classic serial,it’s got everything,secret hideouts armed with deadly death traps!,a mad doctor named satan who is bent on world domination,a big tin can robot with big vaccum hose arms,heroic hero,and a mysterious and thrilling music(by cy feuer) score!.this serial is worth seeing!