Science fiction has its immortals -- authors whose impact was so tremendous that they belong in a class by themselves. Olaf Stapledon extended the boundaries of science fiction to the infinite, and there are few of the major authors who do not directly or indirectly owe him a great debt. This volume of his uncollected short science fiction and fantasy (only one having previously appeared in the United States) includes in addition to the five stories, an uncollected radio script from which this volume takes its title and an uncollected 1948 address to the British Interplanetary Society. To this collection Sam Moskowitz has contributed an authorized biography of Olaf Stapledon from prime sources that make it the most definitive and authentic to date.