This guy Simon Helberg, who's in 'Florence Foster Jenkins,' I might have been vaguely patronizing to him because he hadn't done films before. Gradually, you realize, not only is the guy a much bigger star than me, he's maybe the richest man I've ever met.

I'm over the moon to be involved in the 'Doctor Who' Christmas special. I can't quite believe it as it's a part of the family tradition at the Jenkins household. I heard the news that I got the role on my 30th birthday and it was the best birthday present ever.