Frank Albertson

Ernie Nevers

Cecilia Parker

Francis Ford

J. Frank Glendon

A lady reporter and two college students search for the "Gold Special," a train that disappeared without a trace.

Secret Service Major Steel is one of the few men in America aware of the fact that Captain Albright is also Captain Midnight, daring masked aviator dedicated to fighting gangsters and enemies of America.

A young newspaperwoman travels to a South Seas island to search for buried treasure.

The evil and masked "Gargoyle" is sabotaging all of America's industrial plants. It is up to the Spider to save the country.

A gang of Tripolitan pirates swooped down and kidnapped 13 wealthy brides, whom they held for ransom.

Prospector Henry Tolliver disappears and his son "Wild Bill" Tolliver comes looking for him.

Lieutenant Commander John Byrne of the Naval Secret Service and his partner Pvt. Bill Riggers chase criminal Dr. Sin Fang, who is desperate to find a lost sacred seal. (The fifth and only surviving episode of a six-part serial about an evil mastermind inspired on Sax Rohmer's Dr. Fu Manchu.)

Commando Cody, 'Sky Marshal of the Universe', works with American scientists Joan Gilbert and Ted Richards in the development of a flying suit and a rocket to the Moon. When the nation's defences are being sabotaged and destroyed, Cody learns that an atomic-gun is being used and that the men on the moon are the culprits.

Adventures of an American Secret Service-girl in search of an important German secret during the war.  Chapters: [1] “The Great Secret,”; [2] “Marked for Death,”; [3] “The Gas Chamber,”; [4] “Below the Waterline,”; [5] “The Acid Bath,”; [6] “The Unknown,”; [7] “The Betrayal,”; [8] “A Crippled Hand,”; [9] “Woes of Deceit,”; [10] “The Inn of Dread,”; [11] “The Death Studio,”; [12] “The Chance Trail,"; [13] “Wings of Mystery,”; [14] “The Hidden Way,”; [15] “The Secret Host"