Triplanetary is a science fiction novel and space opera by author E. E. Smith, published in 1948. It consists of two parts. The first explains the series background, which consists of a conflict between the evil Eddorians and the benevolent Arisians. This conflict is carried out throughout the history of an oblivious humankind on Earth. The final part of the book, which was originally published as a magazine story, takes up the tale after civilization has been rebuilt with the covert help of the Arisians; but with everything still at risk... Enjoy the fascinating beginnings of a space opera of the most epic proportions in sci-fi history!