Contents: Dr. Cyclops / by Henry Kuttner — Who goes there? / by John W. Campbell, Jr. — Farewell to the master / by Harry Bates — The fog horn / by Ray Bradbury — Deadly city / by Ivar Jorgenson– The alien machine / by Raymond F. Jones — The cosmic frame / by Paul W. Fairman — The fly / by George Langelaan — The seventh victim / by Robert Sheckley — The sentinel / by Arthur C. Clarke — The racer / by Ib Melchior — A boy and his dog / by Harlan Ellison.