Cover by Jon Arfstrom. Digest size.

The early issues were published in the format of Macfadden's "true story" magazines. To add versimilitude, the magazine was illustrated with double-exposure photographs and the stories often carried double bylines in the form "by X as told to Y," where X

Includes "He Didn't Like Cats" by L. Ron Hubbard.

Cover by Modest Stein. Features "Overthrow" by Cleve Cartmill.

"The Sky Serpent Flies Again" by Robert J. Hogan.

Includes "The Devil's Paymaster" by Maxwell Grant

Cover by Ed Emsh. Includes "The Naked Sky" by James E. Gunn.

"Squadron of the Damned" by Robert J. Hogan.

Final issue.

Includes "The Mind Magnet" by Paul Ernst.

Includes "The Quest of Qui" by Kenneth Robeson.

Cover by Margaret Brundage. Includes "Three Gentlemen In Black" by August W. Derleth.

Includes "The Shadow Men" by A. E. Van Vogt.

Includes "The Day Of The Cloud" by Ross Rocklynne.

Cover by Rogers. Includes "Forces Must Balance!" by Manly Wade Wellman.

Cover by John Howitt. Includes "Hordes Of The Red Butcher" by Grant Stockbridge.

Includes "Mystery On Happy Bones" by Kenneth Robeson.

Includes "The Sign Of Zorro" by Johnston McCulley.

Includes "Blow Cold, Blow Hot" by Frederick C. Davis.

Cover by Boris Dolgov. Includes "Mr. George" by August Derleth.

Cover by A. R. Tilburne. Includes "Black Barter" by Robert Bloch.

Features "Dictator of Crime" by Maxwell Grant.

Final issue.

Cover by Margaret Brundage. Includes "The Druidic Doom" by Robert Bloch.

Cover by John Howitt. Includes "The Yellow Scourge" by Curtis Steele.

Features "Murder Mansion" by Maxwell Grant.

Cover by A. R. Tilburne. Includes "The Valley Of The Assassins" by Edmond Hamilton.

Cover by Gilmore. Includes "Cold" by Nat Schachner.

"The Mystery of the Dragon's Shadow" by Donald E. Keyhoe.

Includes "Master of the Walking Dead" by Joseph J. Millard

"Death to the Hawks of War" by Robert J. Hogan.

Cover by Belarski. Includes "The Ringer" by Charles Rice McDowell.

Cover by F. Tinsley. Includes "Death Rides The Sky" by George L. Eaton.

Includes "The Hag Seleen" by Theodore Sturgeon & James H. Beard.

Final issue.

Final issue as Captain Satan; continues as Strange Detective Mysteries.

Cover by H. W. Wesso. Includes "The Shadow In The Sky" by August W. Derleth.

Includes "Time Column" by Malcolm Jameson.

Cover by Margaret Brundage. Includes "The Hour Of The Dragon" by Robert E. Howard.

Includes "The Suicide Battalion" by Curtis Steele.

Cover by Virgil Finlay. Includes "The Luck Of Ignatz" by Lester del Rey.

"Patrol of the Iron Scourge" by Robert J. Hogan.

Cover by Alex Schomburg. Includes "The Hellflower" by George O. Smith.

Includes "The Seal Of Sin" by Henry Kuttner.

Includes "The Jumper" by Theodore Sturgeon.

Includes Williamson, Wellman.

"Wings of the Gray Phantom" by Robert J. Hogan.

Includes "The Dawn-Seekers" by Frederick C. Painton.

Cover by Margaret Brundage. Includes "The Jest Of Droom Avista" by Henry Kuttner.

Two alternate covers are known to exist.

Cover by Walter Baumhofer. Includes "The Spider Strikes" by R. T. M. Scott.

Cover by C. Meimer. Includes "You Too, Can Be An Army Aviator" by Charles Edward Chapel.

Including "Curse Of The Calaboose Brand" by J. Edward Leithead.

Includes "The Crime Laboratory" by Grant Stockbridge.

Final issue.

Final issue.

Formerly Detective Mystery.

Cover by John Howitt. Includes "Invasion Of The Crimson Death Cult" by Curtis Steele.

Final issue. Cover by H.W. Wesso. Includes "The Cairn On The Headland" by Robert E. Howard.

Final issue.

Cover by Earle K. Bergey. Includes "The Star Of Dread" by Brett Sterling.

Cover by Margaret Brundage. Includes "Lansing's Luxury" by August Derleth.

Includes "The Mathematics Of Magic" by L. Sprague de Camp & Fletcher Pratt.

Cover by Rogers. Includes "Nightfall" by Isaac Asimov.

Includes "The Devil's Playground" by Kenneth Robeson.

Cover by Earle K. Bergey. Includes "A Million Years To Conquer" by Henry Kuttner.

Final issue.

Full length novel: "Fight Or Die" by James M. Calvert, Jr.

Includes "Miracle Of The Golden Princess" by HBedford-Jones.

Includes "Speak For Yourself" by John Quincy.

Cover by Rudolph Belarski. Includes short novel "Sons Of The Tall Timber" by Frank R. Pierce.

Features "Mystery Island" by Kenneth Robeson.

Includes "The Perilous Pearl" by H. Bedford-Jones.

Includes "Hang Him High" by Norbert Davis.

Features "The Time Terror" by Kenneth Robeson.

"The Black Wings of the Raven" by Robert J. Hogan.

Includes "The Dagger In The Sky" by Kenneth Robeson.

Includes "Always Comes Evening" by R.E. Howard.