Daniel Robin has become mixed up with a band of criminals known as "the 13," and is shot when he refuses to do their bidding. His daughter Ruth, brought home from boarding school, reaches his bedside before he expires. He tells her that she will be given thirteen keys. Instructions will be provided with each key and, if she follows the instructions, she will eventually fully learn of her birthright. Many adventures then follow as Ruth attempts to solve the puzzle of each key and establish her true birthright.
Jerry Blake (aka Federal Operator 99) teams-up with Joyce Kingston to thwart the plans of escaped cr...
An expedition arrives on an uncharted jungle island to rescue the local natives, led by a jungle boy...
Escaped Prisoner 39013 impersonates the rich and influential Horace Granville, allowing him to creat...
The obsessive scientist Dr. Miller is working on a matter-transmitter invention called the Paratron;...
Dusty Bates observes some smuggled jewels hidden in a crate aboard a ship; he is pursued by low-life...
Jesse James wants to start a new life in a new location, but quickly finds himself wrapped-up in pro...
Mandrake and his team attempt to prevent "The Wasp" from stealing and using a new Radium invention.
Government agents work to interfere with schemes to trick the Comanches into war with the Texans.
Before the outbreak of WWII, Nazi sympathizers plot to undermine America.
A movie serial in 13 chapters: Some swampland becomes valuable, and various factions squabble over ...
The evil and masked "Gargoyle" is sabotaging all of America's industrial plants. It is up to the Spi...
Beatrice Fairfax, the original advice-to-the-lovelorn reporter and her friend and not-so-secret admi...
The Hazards of Helen is an American melodramatic adventure film serial of 119 twelve-minute episodes...
The Strings of Steel is a silent Action serial. Episode titles: 1. The Voice on the Wire 2. The Firs...
Prospector Henry Tolliver disappears and his son "Wild Bill" Tolliver comes looking for him.
Criminals steal a radium-powered tank from an inventor. His heiress and a government agent take up t...
Two British officers are assigned to collect information to convict Captain Kidd of piracy.
Mota is a Martian representative, who has come to impose interplanetary law on the Earth (which has ...
A young girl journeys to Africa to find her father, an explorer who vanished in the jungle.
Beyond Hell's Gate Pass is territory controlled by a man who calls himself King Carter; he uses a va...