 Nathaniel Billings (Boris Karloff) sells his house off to a naive young woman but stays in order to continue work on his experiments of making superman out of door-to-door salesmen. Dr. Lorencz- the mayor, justice of the peace, notary, sheriff and coroner of the town (played by the multi-talented Peter Lorre)-becomes interested in the experiments after trying to arrest Prof. Billings. After which the hilarity ensues.