Introduction - (1984) - essay by Martin H. Greenberg
The Red Queen's Race - (1949) - novelette by Isaac Asimov
Flaw - (1949) - short story by John D. MacDonald
Private Eye - (1949) - novelette by Henry Kuttner and C. L. Moore [as by Lewis Padgett]
Manna - (1949) - novelette by Peter Phillips
The Prisoner in the Skull - (1949) - novelette by Henry Kuttner and C. L. Moore [as by Lewis Padgett]
Alien Earth - (1949) - novelette by Edmond Hamilton
History Lesson - (1949) - short story by Arthur C. Clarke
Eternity Lost - (1949) - novelette by Clifford D. Simak
The Only Thing We Learn - (1949) - short story by C. M. Kornbluth
Private - Keep Out! - (1949) - short story by Philip MacDonald
The Hurkle Is a Happy Beast - (1949) - short story by Theodore Sturgeon
Kaleidoscope - (1949) - short story by Ray Bradbury
Defense Mechanism - (1949) - short story by Katherine MacLean
Cold War - [Hogben - 5] - (1949) - novelette by Henry Kuttner and C. L. Moore [as by Henry Kuttner]
The Witches of Karres - (1949) - novelette by James H. Schmitz
Not with a Bang - (1950) - short story by Damon Knight
Spectator Sport - (1950) - short story by John D. MacDonald
There Will Come Soft Rains - (1950) - short story by Ray Bradbury
Dear Devil - (1950) - novelette by Eric Frank Russell
Scanners Live in Vain - (1950) - novelette by Cordwainer Smith
Born of Man and Woman - (1950) - short story by Richard Matheson
The Little Black Bag - (1950) - novelette by C. M. Kornbluth
Enchanted Village - (1950) - short story by A. E. van Vogt
Oddy and Id - (1950) - short story by Alfred Bester
The Sack - (1950) - short story by William Morrison
The Silly Season - (1950) - short story by C. M. Kornbluth
Misbegotten Missionary - (1950) - short story by Isaac Asimov (variant of Green Patches)
To Serve Man - (1950) - short story by Damon Knight
Coming Attraction - (1950) - short story by Fritz Leiber
A Subway Named Mobius - (1950) - short story by A. J. Deutsch
Process - (1950) - short story by A. E. van Vogt
The Mindworm - (1950) - short story by C. M. Kornbluth
The New Reality - (1950) - novelette by Charles L. Harness