Triplanetary is the thrilling opening novel of E. E. "Doc" Smith's legendary Lensman series, one of the most influential space opera sagas in science fiction history. Originally published in 1934 and later expanded, this novel lays the foundation for an epic intergalactic struggle between the forces of good and evil, spanning millennia and galaxies. The story follows the secret war between two powerful alien races: the benevolent Arisians, who seek to guide the evolution of intelligent life, and the malevolent Eddorians, a ruthless and expansionist species determined to dominate the universe. Humanity unknowingly becomes a crucial pawn in this cosmic conflict, with Earth's history—from ancient times to the near future—serving as a backdrop for the larger battle at play. Key characters include heroic space adventurers of the Triplanetary Service, an alliance between Earth, Mars, and Venus, who must face dire threats, including space pirates, alien invasions, and superweapons capable of planetary destruction. The novel introduces themes of advanced technology, psychic abilities, and the origins of the mysterious Lens, a powerful tool that will become central to later books in the series. A fast-paced blend of action, intrigue, and visionary science fiction, Triplanetary is a must-read for fans of classic space opera. With its grand scope, larger-than-life heroes, and thrilling space battles, it remains a cornerstone of the genre and an essential starting point for the epic Lensman saga.