"Quite how much he suffers and how extraordinary his willpower is. I think that's his main superhero trait, is that the guy is sort of unstoppably stubborn. He won't cease. And that's great, because you see this character really go through the grinder. It's non-stop punishment for this dude. What he has to become and how quickly he's tested in the new arena that he becomes this person is so violent, so sudden, so non-stop, and psychologically brutal as well as physically very very brutal. It's a huge character arc. So I think that might surprise people."