One of the first roles I had on stage was with a brilliant director in a brilliant play with a brilliant cast, but I just couldn't find my way into the heart of the character. I found myself straining a lot. When it started. I felt lost. That was the Eugène Ionesco play Rhinoceros. I don't think I was prepared for that. I don't think I had the full tool kit to do it justice. It's a very difficult play, it's an extraordinarily difficult part, and I never felt I really got it right. Far from it. To a degree, Hamlet was the same.

I don't call myself an expert because I've played experts. I know a little bit about very little. But it's very hard to not be drawn into saying something, especially if it has to do with the work.

What's not to look forward to? It's like all the actors in all of the films. It's difficult to get Martin Freeman and I in a room together. Imagine what it's like to get myself, Chris Hemsworth, Robert Downey Jr., Elizabeth Olsen... these extraordinary actors who all have careers outside the Marvel Universe.

Sometimes during a conversation with a journalist - where you are answering things you never normally talk about, not even with some of your closest friends - you end up being quite confessional, and you don't think about the amplification of that. No matter how fancy these journalists are, they have editors or political leanings behind their publications, which means that, basically, they're going to shape what you've said into an article they've already written. So you have to be really careful with your words.

I think what I loved in cinema - and what I mean by cinema is not just films, but proper, classical cinema - are the extraordinary moments that can occur on screen. At the same time, I do feel that cinema and theater feed each other. I feel like you can do close-up on stage and you can do something very bold and highly characterized - and, dare I say, theatrical - on camera. I think the cameras and the viewpoints shift depending on the intensity and integrity of your intention and focus on that.

I've turned up to costume parties in the wrong costume. I've made social faux pas a plenty. I've put one foot in front of the other and fallen over.

[Scott Derrickson] is terrific, really sharp on the details, and he's not afraid to go to dark places.