Terra is dying, when a strange man in a blue box comes to comfort her. One moment she has no idea who he is, and the next she remembers - she's known the Doctor her whole life. And he's going to make sure she's never alone.
Stranded on a parallel Earth, the Tenth Doctor finds himself mentoring a traumatized child soldier enlisted in a hopeless war to save humanity. With an endless number of mysteries in sight -- from the enigmatic alien invaders they call Angels, to the strange machines known as Evangelions used in the planet's defense...