Invaders of Earth

Introduction • (1952) • essay by Groff Conklin

Prologue: The Distant Past • (1952) • essay by uncredited

This Star Shall Be Free • (1949) • novelette by Murray Leinster

Part One: The Immediate Past: It Could Have Happened Already • (1952) • essay by uncredited

Castaway • (1941) • shortstory by Robert Moore Williams

Impulse • (1938) • shortstory by Eric Frank Russell

Top Secret • (1948) • shortstory by Donald A. Wollheim [as by David Grinnell ]

A Date to Remember • (1949) • shortstory by William F. Temple

Child of Void • (1949) • shortstory by Margaret St. Clair

Tiny and the Monster • (1947) • novelette by Theodore Sturgeon

The Discord Makers • (1950) • shortstory by Mack Reynolds

Not Only Dead Men • (1942) • shortstory by A. E. van Vogt

Part Two: The Immediate Future: It May Happen Yet • (1952) • essay by uncredited

Invasion from Mars • (1938) • shortfiction by Howard Koch

Minister Without Portfolio • (1952) • shortstory by Mildred Clingerman

The Waveries • (1945) • shortstory by Fredric Brown

Crisis • (1951) • shortstory by Edward Grendon

Angel's Egg • (1951) • novelette by Edgar Pangborn

"Will You Walk a Little Faster?" • (1951) • shortstory by William Tenn

Pictures Don't Lie • (1951) • shortstory by Katherine MacLean

Epilogue: The Distant Future • (1952) • essay by uncredited

The Greatest Tertian • (1952) • shortstory by Anthony Boucher