It is the year 2207. After a decades-long war with an alien race known as the Cho-ta'an, Earth has been rendered uninhabitable and the human race has been driven to the brink of extinction. Humanity survives in a handful of colonies scattered across the galaxy, connected by hyperspace gates. Things look dim for the human race when the crew of a scientific survey ship comes into possession of an incredibly destructive "planet-killer" bomb left behind by a long-extinct alien race. With this weapon, the human alliance could threaten to destroy the Cho-ta'an homeworld, changing the balance of the conflict.But as the ship travels through a hyperspace gate to deliver the bomb to the alliance command, a fluke warping of spacetime send them 1300 years into the past. Stuck in 885 A.D., its engines damaged, the vessel is powerless to deliver the bomb to the human alliance. While the rest of the ship's crew remains in stasis, a small landing craft, led by an engineer named Carolyn Reyes, is sent to Earth to ...