Cover by Schneeman. Includes "Worlds Don't Care" by Nat Schachner.

Includes "The Deadly Dust" by William Fitzgerald.

Includes "Run, Tiger!" by Donald Barr Chidsey.

"The Green Scourge of the Sky Raiders" by Robert J. Hogan.

Includes "Half-Breeds On Venus" by Isaac Asimov.

Cover by John Howitt. Includes "The League Of War Monsters" by Curtis Steele.

Includes "Town Marshall" by Walt Coburn.

Final issue.

Cover by Earle Bergey. Includes "The Blue Flamingo" by Hannes Bok.

Features "The All-White Elf" by Kenneth Robeson.

Cover by John Howitt. Includes "War-Dogs Of The Green Destroyer" by Curtis Steele.

Title changes to CAPTAIN SATAN with Vol. 1 #3. Includes "The Corpse With The Third Eye" by Paul Ernst.

Includes "The Survivor" by H. P. Lovecraft & August Derleth. Digest size.

Cover by Earle Bergey. Includes "Don't Look Now" by Henry Kuttner.

Cover by F. Tinsley. Includes "The Baby Albatross" by Frank Tinsley.

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

Includes "Jeopardy's Jewel" by H. Bedford-Jones.

Final issue.

Includes "Brat" by Theodore Sturgeon.

Includes "Black Fire" by Walt Coburn.

Continued from UNKNOWN. Includes "A Gnome There Was" by Henry Kuttner

Cover by John Howitt. Includes "Rockets From Hell" by Curtis Steele.

Cover by Earle K. Bergey. Includes "The Mask Of Circe" by Henry Kuttner.

Cover by William Timmins. Includes "Doodad" by Ray Bradbury.

Cover by John Howitt. Includes "Citadel Of Hell" by Grant Stockbridge.

Includes "The Gentleman From Hell" by Grant Stockbridge.

Includes "The Lost World Of Time" by Edmond Hamilton.

Includes "A God In A Garden" by Theodore Sturgeon.

Cover by Alex Schomburg. Includes "The White Widows" by Sam Merwin, Jr.

Includes "Border Patrol" by Lieut. P. S. Lyons.

Cover by Margaret Brundage. Includes "The Shambler From The Stars" by Robert Bloch.

"The Land of Terror" by Kenneth Robeson.

"The Squadron of Death Flies High" by Robert J. Hogan.

Cover by Margaret Brundage. Includes "Queen Of The Black Coast" by Robert E. Howard.

Includes "The Bridge To Earth" by Robert Moore Williams.

Cover by J. Allen St. John. Includes "Golden Blood (Part 1)" by Jack Williamson.

Cover by Margaret Brundage. Includes "The Graveyard Rats" by Henry Kuttner.

Includes "Son Of The Forest" by Johnston McCulley.

Includes "Reckoning From Beyond" by Robert Leslie Bellem.

Final issue. Includes "Emeralds Of The Inca" by George Creel.

Includes "A Gentleman In Pajamas" by Charles Neville Buck.

Includes "Hell Below" by Kenneth Robeson.

Includes "Murder Goes To Sea" by Allan R. Bosworth.

Cover by Margaret Brundage. Includes "Shadows In The Moonlight" by Robert E. Howard.

Cover by John Howitt. Includes "Cavern Of The Damned" by Curtis Steele.

"Cargo Unknown" by Kenneth Robeson.

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

Cover by Hannes Bok. Includes "The Robot God" by Ray Cummings.

Cover by Graves Gladney. Features "Black Destroyer" by A. E. van Vogt and includes "Trends" by Isaac Asimov.

"Red Wings for the Death Patrol" by Robert J. Hogan.

Includes "The Gray Creatures" by Zorro.

Includes "The Three Planeteers" by Edmond Hamilton.

Includes "Crime's Stronghold" by Maxwell Grant.

Includes "Pony Express Rider" by A. Leslie.

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

Includes "The Hornet And The Vulture" by Samuel Merwin.

Includes "The Pure Evil" by Kenneth Robeson.

Cover by F. Tinsley. Includes "Destroyers Of The Air" by Lieut. W. M. Wood.

"White Wings for the Dead" by Robert J. Hogan.

Includes "Speak For Yourself" by John Quincy.

Includes "The Infinite Moment" by Henry Kuttner.

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

Includes "The Money Master" by Maxwell Grant.

Small digest size format.

Cover by F. Tinsley. Includes "Soaring And Gliding" by John Du Barry.

Includes "Shoot First-Our Navy Is Ready!" by Corey Beckwith.

Cover by Earle K. Bergey. Includes "Other Eyes Watching" by Polton Cross.

Features "Blood Donor Boomerang" by Frederick C. Davis.

"Flight of the Death Battalion" by Robert J. Hogan.

Features "The Book of Death" by Maxwell Grant.

Cover by Margaret Brundage. Includes "The Black Gargoyle" by Hugh B. Cave.

Final issue.

Final issue.

"Wings of the Death Monster" by Robert J. Hogan.

Includes "And So To Death" by Cornell Woolrich.

Cover by Rogers. Includes "Slan" part 2 by A. E. van Vogt.

Includes "No Greater Love" by Henry Kuttner.

Cover by William Timmins. Includes "Hunch" by Clifford D. Simak.