Contents (view Concise Listing)

• Schwartz Between the Galaxies • (1974) • novelette by Robert Silverberg
• Brightside Crossing • (1956) • novelette by Alan E. Nourse
• Four in One • (1953) • novelette by Damon Knight
• The Sack • (1950) • short story by William Morrison
• The Age of Invention • (1966) • short story by Norman Spinrad
• Grenville's Planet • (1952) • short story by Michael Shaara
• When the People Fell • [The Instrumentality of Mankind] • (1959) • short story by Cordwainer Smith
• Mouth of Hell • (1966) • short story by David I. Masson
• The Snowmen • (1959) • short story by Frederik Pohl
• Goddess in Granite • (1957) • novelette by Robert F. Young
• The Monsters • (1953) • short story by Robert Sheckley
• The Titan • (1952) • novella by P. Schuyler Miller
• The Monster • (1948) • short story by A. E. van Vogt
• The Ark of James Carlyle • (1974) • short story by Cherry Wilder
• The Seekers • (1965) • short story by E. C. Tubb
• Beachhead • (1951) • short story by Clifford D. Simak
• On the River • (1965) • short story by Robert F. Young
• Afterword (Perilous Planets) • (1978) • essay by Brian W. Aldiss
• "How Are They All on Deneb IV?" • (1965) • essay by Brian W. Aldiss [as by C. C. Shackleton]
• Introduction (Perilous Planets) • (1978) • essay by Brian W. Aldiss