Matt Smith on finding out he had been cast as The Doctor. (If I had found out that I got the role of the Doctor, or as a companion, I wouldn't believe it. I would continue not believing it until we finished filming and the episode aired.
Martha Jones is my favourite companion because she saved the world by making people say one word which was doctor. She chose to leave the doctor because her family has been through one year of hell and she laughed at the master before he had the chance to