In this volume of the series of short science fiction stories we discover new sapient races, a race to Mars, planets disintegrating, psionic interlopers, hidden ancient worlds, explosive exploits and time travel.

The stories are: 'Atom Drive' by Charles Louis Fontenay, 'Hot Planet' by Hal Clement, 'Nobel Redman' by Jesse Franklin Bone, 'Seed of the Arctic Ice' by H. G. Winter, 'Silver Dome' by Harl Vincent, 'The Vortex Blaster' by Edward Elmer Smith and 'Time and Time Again' by H. Beam Piper.