Doctor has such a wide emotional range, what does that offer you as an actor? You get to play comedy, drama, tragedy; he gets to be angry and he gets to be ridiculous. He's the cleverest person in the room and the most stupid in the space of two or three lines. I remember when I started I used to get excited at how he can go from A to Z and miss out every other letter. No other character can do that. He can go from A to Z then back to A in the space of four or five lines. When you read the script he's happy, serious ad then back to being really ridiculous again. It's rare that you can find characters that can change that quickly and that drastically. Do you ever look back on scenes and wish you could change any part of your performance? Of course, I think the Angels episode and a couple of the others I looked back and thought about it. But you always do that. But it's just a case of woulda, shoulda, didn't. You have to be prepared an detailed in the moment and just hope for the best. How do you feel about Amy and Rory leaving the show? I was very sad, because I love the ponds and I love Karen & Arthur. I didn't want them to go. But the thing about Doctor Who is that it always changes. You've got to get used to it.