Action Comics #107

Wilbur Wolfingham plots to swindle several wealthy people by convincing them that he can put them in suspended animation for 25 years, then revive them in a fantastic future world with their youth intact. When Wolfingham knocks out his clients for what should only be a few hours, Superman intervenes and puts Wolfingham out too, then creates a fake Metropolis of the future, racked by poverty and despair. Superman explains to Wolfingham and his marks that because people did not strive to create a better world, it fell into ruin. When they see the error of their ways, Superman reveals his ruse.