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.

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

I love having debates with people when they are debates but some people, you just can't. Some people shouldn't be given the oxygen.

Wilf: God bless the cactuses! The Doctor: That's cactI. Alien: And that's racist!

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.

Daleks: [simultaneously] Exterminate! Exterminate! [They fire their weapons, none of which so much as touch the Doctor] The Doctor: Is that it? Useless! Nul points! [to Rose and Jack] It's all right, you can come out; that forcefield can hold back anything! Jack Harkness: Almost anything. [pause] The Doctor: Yes, but I wasn't going to tell them that. Thanks.

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