"Steven Moffat profile at Hartswood Films"

“When you run with the Doctor, it feels like it'll never end. But however hard you try you can't run forever. Everybody knows that everybody dies and nobody knows it like the Doctor. But I do think that all the skies of all the worlds might just turn dark if he ever, for one moment, accepts it.”

“I'm not a psychopath, Anderson, I'm a high-functioning sociopath. Do your research.”

“Do you know how you make someone into a Dalek? Subtract Love, add Anger.”

“What would be the point of having this job if I didn't get to make up some of the maddest possible scenes I've ever had in my head since I was a kid? For him to stand there and take the mickey out of all those monsters — is just hugely exciting.”

“Steven Moffat on Twitter”

“We saw some amazing actresses for this part. But when Karen came through the door, the game was up — she was funny, clever, gorgeous and sexy. Or Scottish, which is the quick way of saying it. A generation of little girls will want to be her. And a generation of little boys will want them to be her too.”