Even though Doctor Strange is an established character, when you're doing an origin story there's a lot of room for manoeuvre.

I know he [Julian Assange] is a man of fierce determination, and now living under the strain of house arrest in the Ecuadorean embassy as a "political exile," as he calls himself.

I keep myself amused and others confused

I'm not one for doing the children's party version: "Hi, I'm a character in a movie and now I'm in reality!" I was doing the last shot of the film before reshoots outside their shop. I was starting my run into the frame and I thought, "You are literally ending where this began. The loop of serendipity's too much to not go in and acknowledge it." I just wanted to see the look on their faces.

To get a horse to hit a mark without a rider, to get it to stand up, to get it to rear, to get it to pick up a bucket and bring it over is amazing. It's hard work and very rewarding but can be dangerous.

I'm quite surprised by how many people grew up with this character [Doctor Strange ].

I really discovered [Dr.Strange] through hearing about this film and first meeting Scott [Derrickson] and getting into it and just opening up and saying, "Okay, this is, like all comics, very much of its era," and my first question was, 'How do you make this film? Why do you make this film now?' and the answers were so enticing that I was like, "I'm in."