Flung across space and time by the sorcery of super-science, John Gordon exchanges bodies with Zarth Arn, Prince of the Mid-Galactic Empire 2000 centuries in the future! Suddenly John is thrust into a last-ditch battle between the democratic Empire World and the tyranny of the Black Cloud regime. Only one weapon—the terrifying Disruptor—can win the struggle for the Empire Forces. But it is so powerful that unless John uses it correctly it could destroy not only the enemy but the cosmos. Could his 20th Century mind cope with the technology of 200,000 years from now?

John Gordon, twentieth century Earthman, is torn from his own time to a far distant future - a time when the entire galaxy is inhabited. But men do not rule the future; our race is only one among thousands, and many of those thousands are sworn enemies of humanity! Gordon, man of the past, is forced to form alliances with the men of the future in a desperate battle to save the human race from final annihilation...