I remember when I read Walter, for example, six years ago now, I said, "This is the role for me." I said that to my family. There was something there that I knew was absolutely right, and that was just based on the character. That's when gut instinct comes into play. I know there are certain things I won't do.

A lot of the times, roles are chosen for us.

My last two characters have been Denethor and Walter Bishop. Both will be hard acts to follow. That sits in the hands of my managers, at present. I just have no idea what's going to be offered to me.

I always loved the challenge. When something new happened, I always used to get quite excited.

I think main storylines are what always intrigued me, with those that were the relationships between the characters against whatever backdrop, whether it was in an ordinary universe or a universe in the future.

I didn't drop into the mannerisms of another version of the character, but I guess I was pretty alert to that.

I'm a character actor, so as a character actor, I'm always looking for something interesting.