I love the acting community at Cambridge. It's really quite committed and serious, since the days of Derek Jacobi and Ian McKellen right through to Emma Thompson and Hugh Laurie.

In 'Thor,' that was my own hair. I grew it out. But I have naturally curly, blonde hair, so I'll never look like that. By the time I got to 'The Avengers,' I had come off two other films, which required me to have it very short. So I dyed it again and it was long enough to use a part of my hairline.

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.

Having seen what I've seen in South Sudan, there's no way I can't talk about it.

You never know what's around the corner. It could be everything. Or it could be nothing. You keep putting one foot in front of the other, and then one day you look back and you've climbed a mountain.

Our job is to represent the truth of human nature, whether you're playing a tender love story that's set in a coffee shop or whether you're in 'The Avengers,' which is set in a Manhattan which is exploding.

Every time you consider a job, you have to check in with your inner compass and say, ‘Does this fit in with how I see what the work is for? Is this going to be something interesting and valuable to contribute to the world?’