Introduction (First Step Outward) • essay by Poul Anderson Prologue (First Step Outward) • essay by Robert Hoskins Cold War • (1949) • short story by Kris Neville Third Stage • (1962) • short story by Poul Anderson Gentlemen, Be Seated! • (1948) • short story by Robert A. Heinlein Jaywalker • (1950) • short story by Ross Rocklynne The Hated • (1958) • short story by Frederik Pohl Sunrise on Mercury • (1957) • short story by Robert Silverberg Hop-Friend • (1962) • short story by Terry Carr The Man Who Lost the Sea • (1959) • short story by Theodore Sturgeon First Contact • (1945) • novelette by Murray Leinster Misbegotten Missionary (aka Green Patches) • (1950) • short story by Isaac Asimov Market in Aliens • (1968) • short story by K.M. O'Donnell ] The Rules of the Road • (1964) • short story by Norman Spinrad Jetsam • (1953) • short story by A. Bertram Chandler