Action Comics #355
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.
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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.
Plot details indexed by the Grand Comics Database (CC BY-SA).