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Ex-mobster Larry McCoy (Billy Nelson) is looking to make a comeback, and finds the means to do so in the work of his eccentric scientist neighbor (terling Holloway), who has invented a super-computer (referred to here as a "thinking machine"). The device, referred to by its maker as "Mr. Kelso," is capable of running multiple operations at once, and McCoy puts it to work -- at first duping the gullible scientist and then taking over control -- planning a series of seemingly perfect bank hold-ups. The Metropolis police are stymied, and Clark Kent (George Reeves) decides it's time for Superman to take a hand. But the computer offers McCoy a way of preventing Superman's interference. And when Lois Lane (oel Neill) starts to investigate, she ends up a captive of McCoy.