Action Comics 252 (Facsimile Edition) #1

Criminal John Corben, who is nearly killed in an auto accident, is given a robot body powered by uranium. When he is hit by bullets meant for Lois, she assumes he is really Superman. Recognizing a good idea, Corben impersonates Superman to collect more uranium. Running out of sources of uranium, Corben learns that he can also be powered by kryptonite. But he doesn't realize that the kryptonite he steals is fake, prop kryptonite and collapses.