If you don't expect to like someone and then you do, that's an incredibly exciting moment.

As we all know, it is the proper duty of every British subject to come to the aid of the TARDIS.

I don't want to think that the stories are finite; I want to feel that they can go on forever.

You'll go out of business if you think people are stupid.

Peter Capaldi, will always be Doctor Who. You retain the title forever. Ask your predecessors, they all think they're the real one. I've had Sunday lunch with Peter Davidson and David Tennant and they're eyeing each other like, 'It's me!

Don't play games with me! You just killed someone I like, that is not a safe place to stand! I'm the Doctor, and you're in the biggest library in the Universe. Look me up.

The trouble with a series as it gets older is it can feel like a tradition, and tradition is the enemy of suspense, and it's the enemy of comedy. It's the enemy of everything, really. So you have to shake it up.