"Triplanetary" by E. E. "Doc" Smith is a classic science fiction space-opera that lays the groundwork for his famed Lensman series. Set across millennia, the story follows a cosmic conflict between the benevolent Arisians and their evil counterparts, the Eddorians, who manipulate human history and bloodlines to create the ultimate weapon against their foes. As humanity unites across the Solar System, it confronts space pirates and enigmatic alien Nevians while mastering faster-than-light travel. Bold adventure, early sci-fi ideas, and epic interstellar battles define this influential work in the genre.