I have always been uncomfortable with a series of movies. I hate that word 'franchise' - it always makes me think of French fries. What I felt each time was that we were going for broke, that this was going to be the last in the series. You can't count on anything.

I changed my name when I was about twelve because I didn't like being called Sue or Susie. I felt I needed a longer name because I was so tall. So what happened? Now everyone calls me Sig or Siggy.

What I love about the 'Alien' franchise is I would do all kinds of films - dramas, comedies, whatever - and every now and then I'd be in this science fiction blockbuster that would re-introduce the character and me to a lot of audiences around the world and allow me to go back and do the smaller films again, so it was really a good balance for me.

It's such a nice change to get to play a wretched, shallow, mergers-and-acquisitions woman. My true colors come out.

When I'm making the movie, I absolutely do. I work so hard, and out of the raw material that is the script and talks I have with the director, the writer, I create, I hope, a very specific person who wouldn't have otherwise existed. However, do I then attach and hang on to the finished product? No. The experience of the creation of the character is what feeds me, what excites me, challenges me.

I think breathing is actually the key to a lot of opening up of other parts of yourself that you haven't used, for any job, but particularly in acting.

People are amazed that I do comedy. I always did comedy.