This classic science fiction novel by Edward Elmer Smith ("Doc Smith") was first serialised in Amazing Stories in 1934. It is an episodic novel that covers a period of thousands of years and tells the story of super intelligences and their human breeding project. The two genetic lines they engineer are designed to be an ultimate weapon in the war with their arch-enemies, the Eddorians. Will they succeed? Find out in this epic work of space opera. This work is part of our Vintage Sci-Fi Classics Series, a series in which we are republishing some of the best stories in the genre by some of its most acclaimed authors, such as Isaac Asimov, Marion Zimmer Bradley, and Robert Sheckley. Each publication is complete with a short introduction to the history of science fiction.