Columbia's 11th serial and the first western serial that James W. Horne solo-directed.

Feature version of the 1938 film serial FLASH GORDON'S TRIP TO MARS. Flash Gordon fights Ming the Merciless once again to ensure the survival of the Earth.

Retired lawman Kentucky Wade and his three buddies, Mike Morales, "Dude" Hanford and "Trigger" Benton come to Brimstone and help their friends Larry Munro and his sister, Lucy , in their fight to retain control of Larry's rich ore mine. "Doc" Hardy , as an old friend of Wade's, joins them in their efforts to keep Matt Keeler , the scheming owner of "The Brimstone News", from his efforts to wrest control of Munro's property and mine. Keller employs a legion of henchmen, and sidelines at running runs guns to Red Hatchet and his tribe so they can also get in on the fray against the Munro's and Kentucky and friends.

In this Western, comprised of 12 chapters from a serial, Kit leads a group carrying a large gold shipment across the wild West. When the Mystery Riders attack and steal the gold, Kit is the only survivor. He later joins forces with the cavalry to retrieve it.

Jim Wallace, a young engineer, is engaged by Hammond, manager of an estate in the Northwest, to build flumes for a logging camp, but Donovan, the superintendent, dislikes him and places numerous obstacles in his way. Virginia Coulson, owner of the estate, and her maid Dot arrive, and when Hammond proposes to Virginia, she refuses his declaration in favor of Jim. Later, when Donovan is found murdered, suspicion points to Jim, who is convicted and sentenced to life imprisonment. Hammond gets evidence on the murderer, Goofus, a half wit, and plans to use it to force Virginia to marry him; Goofus wounds Hammond and, seeing he has not killed him, starts a forest fire. Jim, who has escaped from prison with the aid of his friend, Buddy, rescues Virginia from the burning lodge; Goofus confesses to the murder, and Jim is freed.

Ruth Holt is the efficient private secretary to young architect Elwood Adams. Her polar opposite is Adams' indolent, spendthrift wife Francine, faults which Adams, blinded by his love for her, doesn’t see. Looking to cause trouble, a lounge lizard acquaintance of Francine’s spreads gossip to make her jealous of Ruth. In a business crisis Adams introduces Ruth as his wife to banker Amos Martin but when Francine finds out she flies into a rage and denounces Ruth. After a series of complicated events Ruth reunites the Adams couple and marries the banker.

Bob Norton, seeking his brother's killer, tangles with outlaws, wild horses, and a "wild" boy.

A heavy condensation of the 1936 serial Flash Gordon, with altered musical score. Flash Gordon, Dale Arden and Dr. Hans Zarkov visit the planet Mongo to thwart the evil schemes of Emperor Ming the Merciless, who has set his planet on a collision course with Earth. Released abroad as "Flash Gordon" for countries not interested in booking the serial, and never shown in the USA before 1950, where the title was changed to "Rocket Ship".

The story of a boy, a dog, and a man. The boy discovers he is heir to a shipping line, and travels to Los Angeles, accompanied by inventor/radio operator Bob Whitlock and Irene Blaine. Their journey is aided by Pal, a wolf dog.

A secret agent goes after the gang that stole the crown jewels of a European monarchy.

The Eagle uses sky writing to make threats against a corporation. Nathan Gregory owns a travelling fairground and is thought to be the Eagle. Craig McCoy is a pilot who goes looking for the Eagle when Gregory turns up missing.

A mysterious criminal known as The Whispering Shadow commits crimes by means of a gang he controls by television and radio rays. Jack Norton, whose brother was murdered by The Whispering Shadow, suspects that the eerie Professor Strang - whose ghostly wax museum contains figures far too lifelike - may be involved in the crimes.

When a deadly Nitron ray strikes Earth, Flash Gordon and his friends travel to Mars to battle Ming the Merciless and his new ally Queen Azura.