Look backwards to get some new ideas—ever hear of Brick Bradford and the Time Top? Maybe Prince Valent in Camalot? There is also Crash Corrigan and the Undersea Kingdom? My favorite—the best sieral of them all—Dr. Satans Robots! (with The Cobra).
Are you referring to the 'Mysterious Dr. Satan', featuring 'Copperhead' as the hero of the piece? 'Copperhead' was a last-minute insert, as the opponent of Satan's robot was originally intended to be 'Superman', but plans fell through.