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A fortune handed to Lois Lane (Phyllis Coates) by an organ-grinder's monkey -- a monkey dressed in a Superman costume, no less -- sends her on the trail of a secret formula, the last work of slain Eastern European atomic scientist Jan Moleska (Fred Essler). She finds Moleska's daughter Maria (Allene Roberts) unconscious, and is, herself, knocked cold by an enemy agent; Superman (George Reeves) arrives in time to save their lives, but not to keep the formula from being stolen. When Jimmy Olsen (Jack Larson) is kidnapped while following up a lead to the enemy agents, Superman finds himself with a doubly urgent mission, to save his friend and find the formula. He hopes that the organ-grinder's monkey will lead him to both before it's too late.