Every episode [in a TV series] is a challenge, and what's challenging in most episodes is the monster. You're always a heartbeat from the monster looking ridiculous. You really have to work so hard to make them not look like ridiculous when they turn up on the set.

I'll be a story in your head. That's okay. We're all stories in the end. Just make it a good one, eh? 'Cause it was, you know. It was the best. The daft old man who stole a magic box and ran away. Did I ever tell you that I stole it? Well I borrowed it. I was always going to take it back.

The Doctor: 'You know when grown-ups tell you everything's going to be fine, but you really think they're lying to make you feel better?' Amelia: 'Yeah...' The Doctor: 'Everything's going to be fine.

Well, the world is vastly counted in favour of men at every level - except if you live in a civilised country and you’re sort of educated and middle-class, because then you’re almost certainly junior in your relationship and in a state of permanent, crippled apology. Your preferences are routinely mocked. There’s a huge, unfortunate lack of respect for anything male.

Being the only writer on a successful show is very rewarding.

River Song: Right, I have questions. But number one is this: what in the name of sanity have you got on your head? The Doctor: It's a fez. I wear a fez now. Fezzes are cool.

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!