Fun, that's the word I keep on using. That's the word I worry about when other writer's scripts get too dark. Optimistic. Fun. And to be optimistic and have fun there's got to be a darkness there. I think that's a very British attitude.

Rose Tyler: Can't you come through properly? The Doctor: Then the whole thing would fracture. The two universes would collapse. Rose Tyler: So?

Fun, that's the word I keep on using. That's the word I worry about when other writer's scripts get too dark. Optimistic. Fun. And to be optimistic and have fun there's got to be a darkness there. I think that's a very British attitude.

Writing isn't just a job that stops at six thirty... It's a mad, sexy, sad, scary, ruthless, joyful, and utterly, utterly personal thing. There's not the writer and then me; there's just me. All of my life connects to the writing. All of it.

I would rather be confused for 10 minutes than bored for 5 seconds.

[David Tennant's] Doctor has such humanity, he seems to understand us and he's very warm, so he's a comforting Doctor to be with, and he enables us to be slightly scarier than we had been.

There's nothing better than a party that turns into a death trap.