Spies steal Mr. Terrific′s power-pill formula, and because the pills only work on Stanley, the thieves also need to kidnap Stanley, brainwash him, and sell him to the highest bidder.

The government sends Stanley on a mission to catch a crime gang that requires him to impersonate a safecracker who looks exactly like him, fool the man's girlfriend, and somehow convince the gang that he knows how to break into bank vaults.

Stanley goes undercover as a boxer to obtain evidence that a gymnasium is actually a front for a counterfeiting ring.