Introduction: Giants in the Earth - essay by Isaac Asimov (variant of Giants in the Earth) The Riddle of Ragnarok - short story by Theodore Sturgeon Straggler from Atlantis - novelette by Manly Wade Wellman He Who Shrank - novella by Henry Hasse From the Dark Waters - short story by David Drake Small Lords - novelette by Frederik Pohl The Mad Planet - novella by Murray Leinster Dreamworld - short story by Isaac Asimov The Thirty and One - short story by David H. Keller, M.D. The Law-Twister Shorty - novelette by Gordon R. Dickson In the Lower Passage - short story by Harle Oren Cummins Cabin Boy - novelette by Damon Knight The Colossus of Ylourgne - novelette by Clark Ashton Smith