I personally feel that people feel very reassured by nature because it makes us feel small and that's a good thing for human beings and for society.

My father and I used to tussle about me becoming an actor. He's from strong, Presbyterian Scottish working-class stock, and he used to sit me down and say, 'You know, 99 percent of actors are out of work. You've been educated, so why do you want to spend your life pretending to be someone else when you could be your own man?'

We're all intrigued, in our civilized world that we live in, and curious about how we would get on, on an undiscovered island that is untouched by man.

When a new project comes along, I want to know that the experience is going to be challenging and exciting. Part of me is going to be drawn to doing something new and also the satisfaction of intellectual curiosity.

I had huge fun with Chris Evans, as Captain America, because super-soldier though he may be, he's still a man, up against a God who in his own mind is infinitely superior. Then, in the ring with The Hulk, we've got this silver tongued, lightening quick mind up against the embodiment of rage..Loki has this mercurial, transformative ability, not just physically but intellectually, so not all the fights are purely physical. Mind games? Maybe.

I am so profoundly aware of my lack of skill to make any material difference. I am not a doctor. I can't influence foreign policy. I can't build schools. I can't chemically engineer the protein paste that helps people with acute malnutrition. But I can talk about it, and so can you.

Loki in 'Thor' is the most incredible springboard into a sort of excavation of the darker aspects of human nature. So that was thrilling, coming back knowing that I'd built the boat and now I could set sail into choppier waters.