The Radon zombie series is based on the serial Zombies of the Stratosphere. The "zombies" aren't zombies at all, but martians. It was one of Republics Commando Cody serials, but the rocketman was called Larry instead of Comando Cody. The first serial, King of the Rocketmen takes place entirely on earth but was retitled Lost Planet Airmenso its hard to say what Republics front office was thinking except that "zombie" sounds impressive.