The Great Alaskan Mystery

Two marine lieutenants battle a masked would-be world conqueror who uses electricity as a weapon.

A Secret Service agent seeks his missing brother in Africa, and finds his mission complicated by ivory thieves, a girl with a mysterious past, and a...

A new town doctor arrives at the same time as local Indians needprotection from troublemaking looters.

Man-woman team of investigators uncover a gang whose mad scientist leader has developed an invisibility chemical and plans to build a mercenary army...

Greedy traders have kidnapped a researcher, hoping he will reveal the location of a treasure in a hidden village. Family and friends of the...

A team of two-fisted insurance investigators (one of whom disguises himself as The Masked Marvel) endeavor to discover and thwart the loathsome...

Congo Bill is hired to locate an heiress lost somewhere in Africa.

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.

An accomplished aviator sets out to locate treasure hidden by one of his ancestors. He encounters interference from various adversaries.

A newspaper publisher and his Korean servant fight crime as vigilantes who pose as a notorious masked gangster and his aide.

A police detective is caught up in a plot to steal two million dollars in bonds.