It isn't easy retiring from UNIT, not when you know what's out there. After all that wonder, how can you give it all up and grow old gracefully? What if you could have your greatest desire instead?

Mistakes have been made, so misguided, so human. The Doctor and Camille witness a dark day for the organisation. A creature of unparalleled strength is on the prowl, eager for revenge.

Do not go gently into that good night. Rage, rage against the dying of the light.