Gang Leader Dutch Malone goes on a hunting trip and is in a car wreck and is confined to the hospital, without the knowledge of any of his gang members. District Attorney Brady induces taxidermist Peter Winkly, who is an exact double for Malone,to impersonate Dutch and assume leadership of the gang. Winkly "takes over" the gang and only Rita, Dutch's girl friend, has any suspicion that he is not really Dutch. But Dutch sees a newspaper showing him out on the town, escapes from the hospital and is on his way to look up the impostor.

An ad man gets his model girlfriend to pose as a debutante for a new campaign.

A gangster hides out on a farm and falls for the farmer's daughter.

A bookie uses a phony real estate business as a front for his betting parlor. To further keep up the sham, he hires dim-witted Ellen Grant as his secretary figuring she won't suspect any criminal goings-on. When Ellen learns of some friends who are about to lose their homes, she unwittingly drafts her boss into developing a new low-cost housing development.

Escaped Prisoner 39013 impersonates the rich and influential Horace Granville, allowing him to create a variety of disasters. Fortunately, he is thwarted repeatedly by three daring circus daredevils.

An aging star finally recognizes the truth when she is replaced in her new movie by a girl from the chorus.

Mandrake and his team attempt to prevent "The Wasp" from stealing and using a new Radium invention.

An American pilot with a top-secret invention is kidnapped by foreign agents.

An embittered Louie Peronni returns from prison to find that his sister, Juli Peronni, is engaged to policeman Eddie Farrell, and also finds that his secret wife Annie Qualen has placed their baby girl in a foundling home. With his old gang again, Louie plans a robbery of a fur warehouse. Louie shoots down the night watchman and is trailed home where his father Guiseppe Peronni persuades him not to fight it out with the police. Determined to let Louie take the full rap, the gang kidnaps the district attorney's daughter.

A mad scientist named Dr. Satan plots to steal key pieces of technology to enable him to build an army of robots based on his prototype to conquer America. The only one standing in his way is Bob Wayne, who fights Satan as the enigmatic Copperhead. Mysterious Doctor Satan is a 1940 film serial named after its chief villain. Doctor Satan's main opponent is the masked mystery man, "The Copperhead", whose secret identity is Bob Wayne, a man searching for justice and revenge on Satan for the death of his step-father. The serial charts the conflict between the two as Bob Wayne pursues Doctor Satan, while the latter completes his plans for world domination.