The beauty of science fiction is its open canvas. You can hypothesize about any element of the world. It doesn't have to be laser battles and things exploding, you can be JG Ballad and maybe just change one little thing about the real world and that becomes science fiction.

Here in the UK the audience immediately reacts and they get the fact that: "What would be the most annoying thing in the world?" A Chesney Hawkes alarm clock!

You know, in an ideal world, people would just be intrigued and go and see a film without knowing anything about it, because that's where you're going to have the most experience of a film, the biggest, the most revelation of a film. But at the same time, I think there are benefits of having seen a trailer where you actually look forward to seeing moments in a film knowing that they're coming up. I don't know which is better.

For me, two of my favourite science fiction films are Blade Runner, which is fantastic, and Terry Gilliam's Twelve Monkeys. Both of those were smart science fiction films hitting more of a medium budget, and I desperately hope there is an audience for that kind of film because I would love that to be my next film, on that kind of scale.

I think there is also a certain degree of expectation that's set up by trailers, where even if you know what's going to happen in parts of the film based on the trailer, you almost anticipate and look forward to those moments based on having seen the trailer.

One of the biggest changes for me on a practical level of shooting the film was having a second unit.

I was also a science fiction and fantasy fan, growing up, in games and books and movies. I love Tolkien and I love Dungeons & Dragons, so the opportunity to have a fantasy-based RTS, or real time strategy game, at that time, seemed cool. I started playing it, and the early games were simple, but fun and they had these great heroes.