Number 1 edit
January 1939
Cover art by Robert Fuqua
- I, Robot [Adam Link] • Eando Binder • short story (© Copyright Renewed: details pending.)
- Interplanetary Graveyard • R. R. Winterbotham • short story
- Battle in the Dawn [Hok] • Manly Wade Wellman • novelette
- The Treasure on Asteroid X [Chance Martin] • Frederic Arnold Kummer • short story
- The Scientific Ghost [John Hale] • Ed Earl Repp • short story
- Black Empress • John Russell Fearn • novelette
- Death in the Tubeway • Stanton A. Coblentz • short story
Number 2 edit
February 1939
Cover art by Robert Fuqua
- Wanted: 7 Fearless Engineers! • Warner Van Lorne • novella
- Mr. Craddock's Amazing Experience • William F. Temple • short story
- Valley of Lost Souls • Eando Binder • novelette (© Copyright Renewed: details pending.)
- The Light That Kills • J. Harvey Haggard • short story
- The Phantom Enemy • Morris J. Steele • novelette
- The World That Dissolved • Polton Cross • short story
- Lost on the Sea Bottom • Ed Earl Repp • short story
Number 3 edit
March 1939
Cover art by Robert Fuqua
- The Raid from Mars • Miles J. Breuer • short story
- Valley of Invisible Men • Edmond Hamilton • novella
- Marooned Off Vesta [Brandon, Shea & Moore] • Isaac Asimov • short story (© Copyright Renewed: details pending.)
- The Strange Flight of Richard Clayton • Robert Bloch • short story (© Copyright Renewed: details pending.)
- Vengeance from the Void • Frederic Arnold Kummer • short story
- Trapped by Telepathy • Eando Binder • short story (© Copyright Renewed: details pending.)
- The City That Walked • Ed Earl Repp • short story
Number 4 edit
April 1939
Cover art by Robert Fuqua
- World Without Women • Thornton Ayre • novelette
- Madness on Luna • R. R. Winterbotham • short story
- The Invisible Invasion • Frederic Arnold Kummer • short story
- The Deadly Paint of Harley Gale [Harley Gale] • Ed Earl Repp • novelette
- The Martian Avenger • Polton Cross • short story
- The Flame from Nowhere • Eando Binder • short story (© Copyright Renewed: details pending.)
- Revolution on Venus • Bradner Buckner • novelette
Number 5 edit
May 1939
Cover art by Robert Fuqua
- Secret of the Buried City • John Russell Fearn • novelette
- Where Is Roger Davis? • David V. Reed • novelette
- The City of Oblivion • Bradner Buckner • novelette
- War with Jupiter • W. Lawrence Hamling & Mark Reinsberg • short story
- The Curse of Montezuma [John Hale] • Ed Earl Repp • short story
- The Foreign Legion of Mars • Frederic Arnold Kummer • short story
- The Weapon Too Dreadful to Use • Isaac Asimov • short story (© Copyright Renewed: details pending.)
Number 6 edit
June 1939
Cover art by William Juhre
- World Without Death • Polton Cross • novelette
- The Whistling Death • Abner J. Gelula • novelette
- The Deadly Slime • Frederic Arnold Kummer • short story
- Lundstret's Invention [Martin Langley] • Robert Moore Williams • short story
- Microbes from Space • Thornton Ayre • short story
- The Radio Man Returns [Myles Cabot (Radio Man)] • Ralph Milne Farley • short story
- Brigade of the Damned [John Hale] • Ed Earl Repp • novelette
Number 7 edit
July 1939
Cover art by Robert Fuqua
- Secret of the Pyramid • Robert Moore Williams • novelette
- The Trial of Adam Link, Robot [Adam Link] • Eando Binder • short story (© Copyright Renewed: details pending.)
- Pe-Ra, Daughter of the Sun • Ralph Milne Farley • novelette
- When Time Stood Still • Edwin K. Sloat • novelette
- John Hale Convicts a Killer [John Hale] • Ed Earl Repp • short story
- The Pit of Death • Don Wilcox • novelette
Number 8 edit
August 1939
Cover art by Robert Fuqua
- Warriors of Mars • Arthur R. Tofte • novelette
- World Beneath Ice • Polton Cross • novelette
- The Man Who Walked Through Mirrors • Robert Bloch • short story
- Wives in Duplicate [Ray Lattimer] • Don Wilcox • short story
- Mystery of the Collapsing Skyscrapers • Harl Vincent • novelette
- John Hale's Hollywood Mystery [John Hale] • Ed Earl Repp • short story
Number 9 edit
September 1939
Cover art by Robert Fuqua
- Beast of the Island • Alexander M. Phillips • novelette
- The Underground City • Bertrand L. Shurtleff • novelette
- When the Moon Died [Ray Lattimer] • Don Wilcox • novelette
- Face in the Sky • Thornton Ayre • novelette
- Rocket Race to Luna • Robert Moore Williams • short story
- The Fate Changer • Richard O. Lewis • short story
Number 10 edit
October 1939
Cover art by Robert Fuqua
- Return of Satan • Robert Moore Williams • novelette
- The Missing Year • Eando Binder • novelette (© Copyright Renewed: details pending.)
- The Ice Plague • Frederic Arnold Kummer • short story
- The Priestess Who Rebelled [Meg] • Nelson S. Bond • novelette
- Judson's Annihilator • John Beynon • novelette
Number 11 edit
November 1939
Cover art by H. W. McCauley
- The 4-Sided Triangle • William F. Temple • novelette
- The Hidden Universe [Part 1 of 2] • Ralph Milne Farley • novella
- Whirlpool in Space [Ebbtide Jones] • Miles Shelton • short story
- Dictator of Peace • Don Wilcox • novelette
- Legion of the Dead • Frederic Arnold Kummer • novelette
- Missing: Millions in Radium • Robert Moore Williams • novelette
Number 12 edit
December 1939
Cover art by Julian Krupa
- Fugitives from Earth • Nelson S. Bond • novelette
- Ben Gleed, King of Speed [Ben Gleed] • Don Wilcox • novelette
- Hok Goes to Atlantis [Hok] • Manly Wade Wellman • novelette
- Gulpers versus Earthmen • Frances Garfield • short story
- The Hidden Universe [Part 2 of 2] • Ralph Milne Farley • novella
- Liners of Space • Raymond A. Palmer • short story
- If the Sun Turned Green • Lyle D. Gunn • vignette