Sir James Blake has retired from Scotland Yard so that he can assist his niece Hope and her friend Jerry in developing an apparatus they have invented. Sir James thinks that their invention has the potential to prevent wars, and plans to donate it to the League of Nations. But a gang of criminals led by the elusive "Scorpion" steals the device, and Blake and his associates must recover the invention and determine the identity of the "Scorpion".
A police detective is caught up in a plot to steal two million dollars in bonds.
Man-woman team of investigators uncover a gang whose mad scientist leader has developed an invisibil...
A famous scientist invents a humanoid robot (the titular "monster"), so a greedy rival scientist pla...
Jerry Blake (aka Federal Operator 99) teams-up with Joyce Kingston to thwart the plans of escaped cr...
Escaped Prisoner 39013 impersonates the rich and influential Horace Granville, allowing him to creat...
Famed aviator Bruce Gentry is working with scientist Andrew Benson, setting out to uncover the origi...
An Indian rug is the key to the location of a lost treasure. When the rug's owner is murdered, it b...
Dr. Mabuse and his organization of criminals are in the process of completing their latest scheme, a...
Sergeant MacLane of the Mounties investigates the disruptive activities of a bunch of troublemakers.
A new town doctor arrives at the same time as local Indians needprotection from troublemaking looter...
A newspaper publisher and his Korean servant fight crime as vigilantes who pose as a notorious maske...
An escaped criminal impersonates a Police Commissioner, causing no end of trouble to a determined Fe...
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 ...
Pulp hero "The Spider" seeks to destroy all criminals. In this serialized adventure, he battles The...
Mandrake and his team attempt to prevent "The Wasp" from stealing and using a new Radium invention.
Jesse James wants to start a new life in a new location, but quickly finds himself wrapped-up in pro...
Dick Tracy goes up against a villain known as The Ghost, who can turn himself invisible.
The evil and masked "Gargoyle" is sabotaging all of America's industrial plants. It is up to the Spi...
A mad scientist named Dr. Satan plots to steal key pieces of technology to enable him to build an ar...