Every episode [in a TV series] is a challenge, and what's challenging in most episodes is the monster. You're always a heartbeat from the monster looking ridiculous. You really have to work so hard to make them not look like ridiculous when they turn up on the set.

The story of Sherlock Holmes, on the surface, is about detection, but in reality, it's about the best of two men who save each other - a lost, washed-up war hero and a man who could end up committing murders instead of solving them. They come together. They become this perfect unit. They become the best friendship ever, and they become heroes. That's what we fall in love with, not Sherlock on his own. No one can love that man on his own, but Sherlock Holmes and Dr. Watson - the best friends ever.

It’s been a long time since Sherlock Holmes jumped off that roof - it’s time to reveal the truth about what happened between him and the pavement.

Time travel is always more magical somehow when you go into the past. Traveling into the future is something you do, every day. You're just not going to get very far. So, I rather like the past travel.

There's something that doesn't make sense. Let's go and poke it with a stick.

You can be as beautiful and charming as you'd like, but if you're not terrific at acting, it will mean nothing on the screen.

Nothing can ever be a rule in drama, because then you're saying certain things won't ever happen, and that would be very boring.