When we were filming 'The Darkest Hour,' we didn't even know what the aliens were going to look like, we didn't even have a graphic reference. So it was definitely a big challenge to sell those kind of extreme moments when you're just generating them from your own imagination.

When we were filming 'The Darkest Hour,' we didn't even know what the aliens were going to look like, we didn't even have a graphic reference. So it was definitely a big challenge to sell those kind of extreme moments when you're just generating them from your own imagination.