N° 53 - février 1957 
Couverture de Lloyd Rognan
"Compete or Die"

Compete or Die! • Mark Reinsberg • nv
The Man Who Made Himself • Charles Beaumont 
Outcast of the Stars • Bob Silverberg • ss
The Time Snatcher • Randall Garrett • ss
The Incomplete Theft • Ralph Burke • ss
Bleekman's Planet • Ivars Jorgensen • ss

N° 54 - avril 1957 
Couverture de Lloyd Rognan
"Bring Back my Brain"

Bring Back My Brain! • Dwight V. Swain • na
Secret of the Painting • Robert Moore Williams • 
Harwood's Vortex • Robert Silverberg • ss
Guardians of the Tower • Randall Garrett • ss
The Old Man [by Robert Silverberg] • 
S. M. Tenneshaw • ss
Slaughter on Dornell IV  • Ivar Jorgensen • ss

N° 55 - juin 1957 
Couverture de Lloyd Rognan
"The Sinister Invasion"

The Sinister Invasion [by Edmond Hamilton] • Alexander Blade • na
Kill Me If You Can! • S. M. Tenneshaw • ss
Six Frightened Men • Randall Garrett • ss
The Three Thieves of Japetus • Mark Reinsberg •
Woman's World • Robert Silverberg • ss

N° 56 - août 1957 
Couverture de Malcolm Smith
"Battle Out of Time"

Battle Out of Time • Dwight V. Swain • na
The Hostile Survivors ["They Blow Up"] • A. Bertram Chandler • ss
Skid Row Pilot • Randall Garrett • ss
Reality Unlimited • Robert Silverberg • ss
Flight into the Unknown • Tom W. Harris • ss

N° 57 - octobre 1957
Couverture de Llyod Rognan

You Can't Buy Eternity! • Dwight V. Swain • na
John Holder's Weapon • Robert Moore Williams 
The Mannion Court-Martial • Randall Garrett • 
Overlord of Colony Eight • Robert Silverberg • 
The Ambassador's Pet • Alexander Blade • ss
Barnstormer • Tom W. Harris • ss

N° 58 - décembre 1957
Couverture de Malcolm Smith

The Cosmic Looters [by Edmond Hamilton] • Alexander Blade • na
Death Walks on Mars • Alan J. Ramm • ss
A Madman on Board • Robert Silverberg • ss
Never Trust a Thief! [by Robert Silverberg] • Ivar Jorgensen • ss
Get Out of My Body! • Tom W. Harris • ss

N° 59 - février 1958
Couverture de Malcolm Smith
"The Cosmic Looters"

The Cosmic Looters [by Edmond Hamilton] • Alexander Blade • na
Death Walks on Mars • Alan J. Ramm • ss
A Madman on Board • Robert Silverberg • ss
Never Trust a Thief! [by Robert Silverberg] • Ivar Jorgensen • ss
Get Out of My Body! • Tom W. Harris • ss

N° 60 - avril 1958
Couverture de Malcolm Smith
"Corridor of the Sun"

Corridor of the Suns • Edmond Hamilton • na
Flypaper Planet • A. Bertram Chandler • nv
The Mind Digger • Winston Marks • nv
Morgan's Lucky Planet • Lloyd Biggle, Jr. • ss
Goodbye, Dead Man! • Tom W. Harris • ss

N° 61 - juin 1958
Couverture de Malcolm Smith
"The Friendly Killers"

The Friendly Killers • S. M. Tenneshaw • na
Voyage to Procyon • Robert Silverberg • ss
Menace from Vega • Robert Randall • ss
Prisoner of War • Randall Garrett • ss
Come Into My Brain! • Alexander Blade • ss

N° 63 (dernier numéro) Octobre 1958
Couverture de Malcolm Smith
"The Assassin"

The Assassin • Harlan Ellison • na
The Vicious Delinquents • Mark Reinsberg • 
Miss Impossible [ghost written by John W. Jakes] • C. H. Thames • ss
The Miserly Robot • R. J. Rice • ss