A visitor to a big city gets involved in intrigue when a look-alike jewel thief sets out to doublecross his gang.

An inventor develops a new type of aircraft. A crooked businessman attempts to buy it but the inventor refuses to sell it to him, whereupon the rejected businessman and his henchmen steals the plane and its blueprints. The plane's test pilot, who is the boyfriend of the inventor's daughter, and his sidekick set out to get the plane, and the plans, back.

A prospector is murdered by The Cactus Kid and his gang, who hope to find the murdered man's goldmine. The miner's dog, Rin-Tin-Tin, recognizes the killers, who thereafter seek to use the dog to locate the lost mine. With the help of a government agent and a young girl, Rinty saves the mine and brings the bad guys to justice.

A young girl, who is about to receive a large inheritance, is abducted to an isolated sanitarium where a crazed doctor is performing strange experiments.

Jim 'Socker' Conway, former boxer and FBI hero, is maneuvered for political reasons into a do-nothing job in the district attorney's office. Meanwhile, he meets wild debutante Letty Lane, girlfriend of mob mouthpiece Steve Lawrence; and Letty's much nicer sister Susan. Now the slot machine gang brutally beats Jim's friends Franz and Otto. And Jim finds a way to use his nominal position to go into the racket- busting business. But his success puts Letty in deadly peril...

A Japanese man claiming to be Mr. Moto, of the International Police, is abducted and murdered soon after disembarking from a ship at Port Said in Egypt. The real Mr. Moto is already in Port Said, investigating a conspiracy against the British and French governments.

A wildcat oil outfit is seeking to take over the ranch belonging to Pop Martin and his son Bob and daughter Helen. Bob sends his ex-army pals a "stay-way" message, which brings them on the double. The WW II vets use their jeeps, first for a cattle roundup, and then to round up the gang of crooks, including the crooked family-lawyer Thatcher, brains of the gang.

Two competing jewel thieves hunt for a load of diamonds.

The story of a decent, law-abiding saloon owner who gets himself in trouble with the corrupt city fathers when he attempts to close down the town's watering holes at midnight and on Sundays.

A cop is fired from the force and attempts to solve a string of truck holdups.

An ex-con makes for a backwoods town intending to rob the bank, and becomes involved in protecting three orphans from land swindlers instead.

Very first of the Juvenile Comedies series.