I had no intention of replacing Arnold [Schwarzenegger]. There were a few things that made me want to do the movie. They were the script which had a different direction to it, and it was a chance to do a very different Quaid. I didn't read the short story until I went to college.Reading the story had a different effect on me of how I pictured him to be and the tone of the story was different. In the story, he's a bit more of an everyman.

When I started doing television, I thought that I would change the way that I shot, the way that I blocked, and the technical side of it. You're not going to change your relationship with the actors or how you approach the characters. That wasn't any different.

I wanted to do something that dealt with more of paranormal techniques that wasn't a horror movie. It is an action movie that deals with a special operations group. But if a Tier One team went in to take out Bin Laden today, if you had those kind of abilities, of course you would use that kind of group. And it was more going into that arena. And I wanted to make it feel more like, grounded, as if we had this ability.

It was practically with people with strings. There was no CG involved, it was just painfully taking Collin [Farrell] and Jessica Biel and putting them upside-down, we built the set upside-down and just try to twist perspective to make it all seem like zero gravity. And it was one of the most difficult things I've ever shot.

I think that it drives from an emotional connection with everybody that pulls you through all of those events, whether it's the events or what would be more the action, or I guess the visual effects side of it. So it always starts with me from - emotionally - 'Why do you care about the people who are going through what they're going through?' Because it takes a hell of a lot to put them through that. So you better care for them when they're doing it.

Being a fan of science fiction, I collect a lot of science fiction art work and so if you go to my house there's like a library and you just geek out on science fiction material. A lot of the colony worlds specifically are built as a melting pot of different societies, because the world is at a point where there are only two zones that are left inhabitable.

I'm not a crazy horror fan. At that time i wasn't really looking to do something like that. But I thought to put a twist on it to put a werewolf versus vampire... 'What's the best opponent for a werewolf?' Became the idea of vampires and what about putting those two together? And ultimately it got turned down. But we loved the idea and shopped it around.