The Terran survey ship Aurora makes a startling discovery in an uncharted star system: two planets inhabited by an advanced, and decidedly unfriendly, non-human civilization. Disabled by gigantic alien warships before it can escape, the Aurora is boarded by nightmarish blue-skinned warriors with claws and fangs who slaughter the crew in ritual combat using primitive weapons. The sole survivor, Midshipman Ichiro Sato, is returned to Earth as a messenger bearing a device that warns of an impending attack.

For that is the way of the Kreelan Empire, which has waged war against countless civilizations across the stars in its quest for a savior, one not of their own blood, foretold in an ages-old prophecy. With only a few generations left before their ancient species faces extinction, the Kreelans will wage their last war against humanity, hoping against hope for redemption of sins long past.