The Borg—half organic and half machine, they are the most feared race in the known galaxy. In their relentless quest for technological perfection, they have destroyed entire star systems, enslaved countless peoples, and, in a single brutal attack, decimated Starfleet's mightiest vessels. Only a final desperate gambit by Captain Picard and the USS Enterprise crew stopped the Borg from conquering the entire Federation. And now they have returned.