Good-hearted but inept cop Melvin moonlights as a stand-up comedian. Billing himself as "The Unknown Comic," he wears a bag over his head to boost his courage and protect his career on the police force. Melvin is already having enough trouble maintaining his "double identity" when a joke-cracking thief commits a series of crimes while wearing Melvin's trademark bag over his head. Now, "The Unknown Comic" is the chief suspect, so Melvin has to find the real robber, fast ... before he ends up behind bars!