An outlaw impersonates Shamrock in order to lease his land to an oil company for $75,000.

Frankie Foster and Stanley Benson are a pair of small-potatoes performers. Both try to make it to the big-time after winning an amateur talent contest. Though this leads them to a few professional gigs, something is missing from their act and they are not popular. Believing a little cash will boost their career, Frankie heads for Washington, D.C. to see if her wealthy father will help them. En route Frankie is mistaken for the wife of the well-known pilot Johnny Pearson and ends up in his suite having to pretend she is his spouse. When the pilot meets her, romantic sparks fly.

The obsessive scientist Dr. Miller is working on a matter-transmitter invention called the Paratron; a conspiratorial team of spies and no-goods pursue him to Alaska, trying to steal the device.

In this remake of No Man's Range (1935), Shamrock travels to the ranch of his stepfather who he has never met and finds himself caught in the middle of a range war.

Loggers Jeff Collins and Boomer Benson compete for a mail-order bride by means of a timber-cutting contest.

In this entry in the enduring series, the suave jewel thief finds himself helping the police break up a ring of diamond smugglers. Along the way, he winds up accused of both robbery and murder.

After fighting in the Crusades alongside Richard I of England, Sir Allan Claire returns home to marry his betrothed Lady Christable. Accompanied by his sister Lady Marian, the two are intercepted by Robin Hood and his band of Merrie Men. Recognizing a friend of King Richard, Robin informs them that Lady Christabel is to be wed to another against her will in the interest of politics and her father's fortune. The three team up to rescue the fair lady.

Shamrock and Lucky team up to drive the Tulliver Brothers out of Heldorado.

Blackie is seen leaving a Chinese laundry where the proprietor has been murdered, and must track down the real killer in Chinatown.

Down-on-his luck entrepreneur Bill Martin and sidekick Stuff Oliver try to stay one step in front of creditors in their seedy waterfront office when they meet The Captain, an idiosyncratic peg-legged old sailor. The Captain is convinced that the treasure of pirate Sir Henry Morgan is hidden somewhere in a castle on an offshore island recently inherited by Martin. His proof is a treasure map, half of which has been stolen by a mysterious Phantom who lurks in the shadows waiting for an opportunity to steal the other half. Sensing a moneymaking opportunity, Bill tries to recruit customers willing to pay $50 apiece for a treasure hunt outing to the haunted island. Among those signing up are heiress Wendy Creighton and her bored, ineffectual boy friend, a dimwitted police sergeant, a professor whose expertise is old maps, a wanted murderer and his moll, and Bill's cousin George, who has recently offered $20,000 to buy the supposedly worthless island. They all get more than the few goosebumps they bargained for as death and the Phantom await them in the ghostly castle.