Number 1 edit
March 1945
Cover art by Robert Gibson Jones
- "I Remember Lemuria!" [Mutan Mion] • Raymond A. Palmer • novella
- The Martian's Masterpiece • Morris J. Steele • short story
- Moon of Double Trouble • Raymond A. Palmer • novelette
- Is This the Night? • Alexander Blade • short story
- Comet from Yesterday • Leroy Yerxa • novelette
- The Lying Lie Detector • Leroy Yerxa • short story
- Valley of Delirium • Richard Casey • novelette
- Twirl My Turbine, Man Alive! • Omar Geer • short story
- Dr. MacDonough's Encephalosemanticommunicator • Leo A. Schmidt • short story
Number 2 edit
June 1945
Cover art by Robert Gibson Jones
- Thought Records of Lemuria • Richard S. Shaver • novella
- Weep No More, My Robot • Chester S. Geier • short story
- Invaders from the Monster World • Edmond Hamilton • novelette
- The Radiant Rock • Frances M. Deegan • novelette
- The Scarlet Swordsmen • Don Wilcox • novella
- Peril from the Outlands • William Lawrence Hamling • short story
- I'll Be Fleeced • Berkeley Livingston • novelette
Number 3 edit
September 1945
Cover art by Robert Gibson Jones
- Cave City of Hel • Richard S. Shaver • novelette
- The Animated Tenpin • William Lawrence Hamling • short story
- The Voice from Venus • Don Wilcox • novelette
- Cursed Cavern of Ra • Leroy Yerxa • novelette
- Something for Herbert • Frances M. Deegan • short story
- Mysterious Crater • Leroy Yerxa • novelette
- Two Worlds to Conquer • Elroy Arno • novelette
- Don't Look Behind You • Richard Casey • short story
Number 4 edit
December 1945
Cover art by Robert Gibson Jones
- Quest of Brail • Richard S. Shaver • novella
- Planet of the Duplicates • William Lawrence Hamling • short story
- Mirage World • Chester S. Geier • novelette
- The Miracle of Bulldozer Mike • Robert Moore Williams • short story
- Me and My Shadow • Berkeley Livingston • novelette
- Let Freedom Ring! • Rog Phillips • novelette
- Gallery of Glacial Doom • Frances M. Deegan • short story