...The very word 'fiction' implies another world, literally a different place, whereas no one claims that a dedicated sportsman is escaping his life, or a chef or a nurse. But the poor writer - the sci-fi one especially - is seen as running away. Bollocks. This is real, for me, and it's tough, it's fun, it's practical, and it's very, very important.

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.

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

Drama's not safe and it's not pretty and it's not kind. People expect the basic template of television drama where there might be naughty villains, but everyone ends up having a nice cup of tea. You've got to do big moral choices and show the terrible things people do in terrible situations. Drama is failing if it doesn't do that.

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

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.

Maybe that's when bad scripts are written, when you choose the theme first. I consider that I've something to say when I've thought of a person, a moment, a single beat of the heart, that I think is true and interesting, and therefore should be seen.