Introduction / R. Silverberg -- The star / H.G. Wells -- Twilight / J.W. Campbell -- Nightfall / I. Asimov -- Private eye / L. Padgett -- The sentinel / A.C. Clarke -- Specialist / R. Sheckley -- Common time / J. Blish -- The game of rat and dragon / C. Smith -- All you zombies / R.A. Heinlein -- The subliminal man / J.G. Ballard -- I have no mouth, and I must scream / H. Ellison -- the heat death of the universe / P.A. Zoline -- The library of Babel / J.L. Borges.