Karl Keller, a scientist in an Iron Curtaun country, has been held in a prison camp for years when he discovers a cache of Kryptonian chemicals that were shot into space because they were too dangerous. He experiments with them and then uses them to gain super-powers, traveling to Metropolis to challenge Superman, whom he blames for never rescuing him from captivity.; Luthor is accidentally killed during a battle with Supergirl, and she travels to Atlantis and into outer space to find a way to restore him to life. Alive again, Luthor declares that he now hates Supergirl even more than Superman because she has made him a laughing-stock by saving his life.