Captain Bob Dayton and Lieutenant Ed Carey are partners in a company called "Sky Raiders" which seeks US government contracts for its inventions. Enemy spies attempt to steal, sabotage and discredit the inventions and founders of the company.
Four youthful cadets are implicated in a series of murders, and must attempt to clear themselves of suspicion.
An escaped criminal impersonates a Police Commissioner, causing no end of trouble to a determined Federal Agent.
A police detective is caught up in a plot to steal two million dollars in bonds.
An expedition arrives on an uncharted jungle island to rescue the local natives, led by a jungle boy, from a volcano that is about to erupt.
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.
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 become too dangerous); opposing his authority is Kent Fowler, who resists the alien plot, without understanding its details.
15 part adventure serial directed by W. S. Van Dyke survives in a Russian archive.
Six part adventure serial starring Mary Fuller as the sought after heroine. Episodes: 1) A Proposal From The Duke; 2) A Proposal From The Spanish Don; 3) A Proposal From The Sculptor; 4) A Proposal From Nobody; 5) A Proposal Deferred; 6) A Proposal From Mary
Prior to the United States' involvement in World War II, the masked vigilante Spy Smasher fights Nazi agents operating within the US, led by the treacherous sabotage leader codenamed The Mask.
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 variety of schemes to prevent the railroad from being built, for fear it will finish his control of (what he considers) his land.
Jerry Blake (aka Federal Operator 99) teams-up with Joyce Kingston to thwart the plans of escaped crime boss Jim Belmont.
Notorious pirate Joaquin Santos lives by the saying, "Dead Men Tell No Tales". He conspires with the prominent Squire Rattray to take over and plunder the Lady Jermyn, a ship carrying a considerable amount of gold, and then destroy the ship and kill its crew. Rattray, who is in love with Santos' daughter Eve, agrees to pick up the pirate, his crew and their loot on his private yacht after the deed is done. However, young George Cole, a passenger on the Lady Jermyn who is also in love with Eve, survives the attack and sets out to find her.
Following the Spanish-American War, a soldier is given the assignment of finding the leader of a band of rebels in the Philippines. In order to do this, he must romance Roma, a cabaret spy working for the rebels. This does not please the daughter of his commanding officer, whom he is romancing.
Martin Sondes is an easy-going cowhand going up against a shady, saloon owner called "Square Deal" Fenton, whose chief means of making money is befuddling cowpuncher's brains with liquor and then cheating and robbing them of their money.
The naïve Sheila Fairfax (Brent) plays with men’s emotions without fully comprehending the risks leading to several dangerous situations from which she and the man she loves to barely escape with their lives.
Man-woman team of investigators uncover a gang whose mad scientist leader has developed an invisibility chemical and plans to build a mercenary army of invisible men.
Greedy traders have kidnapped a researcher, hoping he will reveal the location of a treasure in a hidden village. Family and friends of the researcher come looking for him. Adventure ensues.