Triplanetary (The Lensman)

This is the first of E. E. "Doc" Smith's six Lensman books, and although it isn't as fast-paced as later Lensman novels, it sets the stage for what is perhaps the greatest space-opera saga ever told. Through a series of vignettes spanning millions of years, readers will learn how the titanic struggle between the good Arisians and the evil Eddorians first came to pass, and about how humanity was chosen (and bred) to assume the awesome power of the lens. A short foreword by science fiction scholar John Clute puts the entire series into perspective.