It's one of the things that attracted me to the role [Doctor Strange] is the fact that it's a really widely origin story, I mean this is part of it, but of course there's the whole chapter before where he's the neurosurgeon who has the accident. It's fantastic.

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.

[While voicing cartoons] you have to lose your sanity and inhibitions and any kind of dignity and just throw yourself around a bit.

For brain surgeons it's particularly difficult to deal with failure. It was fascinating to learn about that whole world.

There are very specific demands, though, in television, and you notice the budget constrictions. It's the time constraint and a purse constraint more than anything else that you notice. But the ambition of the writing and, hopefully, the delivery of it gets better and better because we want to outdo ourselves to keep ahead of a very expectant and hungry public.

It's very easy to be cynical about any kind of interference in things that are beyond our skill set.

I've said for quite a long time I'd like him to have a different haircut. I quite like my hair being short. You know, we've been away two years, let's f*** around with his outfit, let's f*** around with his haircut, let's do something different.