Doctor Strange is selfish but he's still saving lives.

I've gone up two suit sizes. The character I'm playing, he's strong, I can say that much. I've changed my physique a bit, so that requires eating like a foie gras goose, well beyond your appetite. Providing I don't feel too ill, I then work out two hours a day with a phenomenal trainer. It's the L.A. way.

You have to sometimes just run with the problem rather than trying to solve it with hi-tech wizardry and lots of planning.

[on BBC's Sherlock] It's a rare challenge, both for the audience and an actor, to take part in something with this level of intelligence and wit. You have to really enjoy it. It's a form of mental and physical gymnastics.

I'm very proud of the work I do, but I genuinely can't involve myself with an audience as early as somebody who's not part of the film can. So there's that side of theater that appeals to me, where you give something and the response to what you've created is a communion between you and the dark that contains however many people. It's thrilling not having a reflection other than through the people you're communicating with. But people ask, "What do you prefer?" and I don't have a preference. I love them both. I really do.

I'm aware of [Doctor Strange] place within the comic pantheon of it all, the Marvelverse, but I don't email saying, "When are we doing next film?" I'm excited to see.

There are very specific demands, though, in television, and you notice the budget constrictions. It's the time constraint and a purse constraint more than anything else that you notice. But the ambition of the writing and, hopefully, the delivery of it gets better and better because we want to outdo ourselves to keep ahead of a very expectant and hungry public.