Cyber Leader: Daleks, be warned. You have declared war upon the Cybermen. Dalek Sec: This is not war - this is pest control! Cyber Leader: We have five million Cybermen. How many are you? Dalek Sec: Four. Cyber Leader: You would destroy the Cybermen with four Daleks? Dalek Sec: We would destroy the Cybermen with one Dalek! You superior in only one respect. Cyber Leader: What is that? Dalek Sec: You are better at dying.

It's tough and it should be tough - it should never be easy to be given millions of pounds to make a drama. The coalition government is doing terrible things to the BBC, but drama will survive even if we end up putting on a play in a backroom of a pub.

I dread the day I leave [Doctor Who], because then I'll have to go back to writing bedrooms and offices and pubs. And maybe a field, if I'm lucky.

The Doctor: Rose... before I go, I just want to tell you: you were fantastic. Absolutely fantastic. And do you know what? [Pause] So was I!

What Rose brings to the Doctor’s life is completion. It’s completing a circle – he’s male, he’s alien, he’s a traveler. Between the two of them together they complement each other and discover each other. And are in love with each other – absolutely, unashamedly, unreservedly.

In the end I sort of though we created a companion who was so alive and dynamic and so wedded to the doctor that you’d need a whole universe to contain her in. The only way to get rid of her is to send her into a parallel world from which she can never return; otherwise she would stay with the doctor forever.

My God, that scene in Monster Inc. where the monsters realise that their entire world is founded on hurting children -look at that for a change! Two galumphing cartoon characters making a shattering realisation about their world and their role in sustaining it. A truly epic moment. It's stunning.