Every week, you're saving each other's lives, and you're going through these adventures together, so the stakes are always pretty high. It's funny, you meet one monster or one villain and you've kind of done it two weeks before. But that's it - every story is kind of a self-contained adventure, the stakes are always high with everything. And the amount of energy! Matt described it as a dance once, and that's a nice way, I think, to look at it. Steven's writing has a rhythm to it.

I think the [thing] that everyone noticed is that there is something about Matt, in particular in the part but also in general, that he combines old and young, he just has that. There's something quite boffiny about him. He's a hipster boffin ... irresistible. The thing is, the Doctor's a thousand years old, or over a thousand now, so his apparent age is a lie. So you want there to be mixed signals, I suppose. If you look at, even the William Hartnell Doctor, although he's an old man, he's quite childish. So there's always [been] that sort of contradiction, and that is irresistible.

For the anniversary, it sort of takes care of itself, really. Things like the Daleks or rebuilding the original TARDIS set - I knew what they were going to do to long-term fans, and the pictures that have been released have done exactly that. Their heads have exploded, as mine did. But I wasn't tailoring anything specifically for the anniversary, because telling the story of how it began that's what I'm doing. I'm so happy as well to have [done it] this way because it's such a good companion piece to the actual episode, the anniversary episode. In a way, you watch this first to see how it happened, and then you catch up and really start again.

I didn't have a particular favorite. I seem to remember I just accepted the fact that it was a different Doctor, and I saw quite a lot of the other ones, and I remember half of them, certainly. I was in my teens, my late teens, I think. I remember them all, really, but without watching every episode, I would kind of sometimes miss one or two, but I always kept in touch with it.