"Triplanetary" by E. E. Smith is a foundational work in the space opera genre, setting the stage for the epic Lensman series. The narrative unfolds over vast stretches of time, beginning with the collision of two galaxies, which leads to the formation of numerous planetary systems. The story introduces two ancient and powerful races: the Arisians, who are humanoid and dedicated to the exploration of the mind, and the Eddorians, amorphous beings driven by an insatiable lust for power. As the galaxies merge, the Eddorians seek to dominate the universe, while the Arisians work to counteract their influence by guiding the evolution of intelligent life across various planets. The plot focuses on the planet Earth, known as Sol III, where the Eddorians have begun to manipulate human affairs to sow chaos and discord. The Arisians, aware of the Eddorians' presence, work covertly to foster the development of a race capable of resisting Eddorian control. The narrative follows the rise and fall of civilizations, such as Atlantis, as they struggle against the Eddorians' machinations. The Arisians' ultimate goal is to create a Galactic Patrol, a force strong enough to challenge the Eddorians and ensure the survival of Civilization. The novel explores themes of power, evolution, and the eternal battle between good and evil. It sets the stage for the development of the Lens, a powerful tool that will become central to the series, and introduces the concept of a cosmic struggle that transcends individual planets and races.