"There's someone coming. I don't know where he is, or what he's doing, but trust me, he's on his way..
There's a man who will never let us down. And not even an army can get in the way..
He's the last of his kind. He looks young but he's lived for hundreds and hundreds of years.
And wherever they take you, Melody, however scared you are, I promise you, you'll never be alone..
Because this man is your father.. He has a name but the people of our world know him better.. as the Last Centurion."
- Amy Pond, A Good Man Goes to War (June 4th 2011)
Written by Steven Moffat