Playing the warrior was very interesting to her. “You realize, as a woman, you think just in terms of sort of desexualizing everything. You keep yourself quite small and if you are out by yourself you don’t want to attract too much attention. You have to keep yourself quite covered and all that. If you are trying to become a warrior, you have to really smash through that whole instinct and open up your body like mad. Your legs are sort of opened. Your chest is opened. And you are making noise, punching people. It was quite an insight to what it feels like walking around as a man. And what it feels like being a woman, which is very different. I just found that interesting personally, and quite liberating, actually.

The female Vampire had to have chemistry with the Lycan, played by Scott Speedman, but that wasn’t a problem. “Everybody got along well on the movie. I think he was kind of off his normal game, and so was I. The director, it was his first movie. The writer, it was his first movie. And the stunt coordinator, it was the first thing he was stunt coordinating. So there was kind of a really magical energy to it, that nobody was doing it for the money or doing it just because this was what they always do. Looking back, it feels like missing it like you miss summer camp when you were a kid. It was really a great experience. It really was.”

And it shows on the big screen. Another thing you’ll be seeing is tight costumes, especially that of Selene’s. “This is the thing: When a woman is told she is going to be wearing a black latex jumpsuit, she immediately goes into a flat spin,” Kate tells ComingSoon.net. “I arrived in Budapest thinking, ‘Well, he is not going to know where it needs to fall on the hips, where this is going to happen. I need to tell him.’ Basically every time I had a single remark, he’s taken care of it. So that is really how the whole relationship went in the movie. We just happened to have the same eye and taste, and that was a huge relief to me, because I never found myself wearing something I didn’t feel completely comfortable in.”

Kate was able to keep the costume, but her husband - the director Len Wiseman - hasn’t made her put it on for any special occasions… yet! In the film, the costume’s look helped her play the character. “It does help out. I mean, I’d done two or three months of training before I came in and had costume fittings for ‘Underworld.’ I was really glad that I had that training because I think I would have felt much more like a model in a music video than the character, at that point, because I’d already learned how to box and how to fire guns and how to do all that stuff. And it’s kind of a kinky outfit. So without the training, I would have felt fetishy and a bit funny.”

She also had to wear Vampire teeth and contact lenses, of course. “The teeth were so comfortable. But I would always take them out because you can’t eat, and it makes talking slightly more of a challenge. But there was times where the makeup artist and I would just get to the end of the scene and I go, ‘Oh S***, teeth!’ And she would go, ‘Oh S***! Did he notice? Should we say anything? No!’ There are a couple of scenes in the movie where she forgot to put them in.”

The contact lenses didn’t make her see any better. “They were very bright blue, and quite difficult to see out of. It was good for me, because I don’t see very well anyway. So they happened to get them in my prescription. I saw a little bit better than I normally do and a little bit worse at the same time. It’s kind of the same thing. They are a bit cloudy. You don’t have any peripheral vision, so that was difficult, if you were wearing them and doing the wire thing and having to land in the right place.”

The movie filmed in Budapest, Hungary last year, which help the actors get their minds around the serial aspects of the story, that the creatures really exist. “I didn’t find that too difficult. I think that actors become actors because they’ve got a fairly rampant imagination anyway. That didn’t really bother me. Especially with the world that we created, it’s very much a contained world, and we felt like we were in one. We were mainly shooting at night; it felt like nobody was out but us. So kind of the ’suspension of disbelief’ thing was pretty good on the movie.”

Kate didn’t think the role would be too challenging. “Not while I was doing it at all. I did have that shortly before I left, where my agent said ‘it’s very good that you are doing this because the whole movie is you. And if it does well then it’s all basically done to you.’ And I thought if it sucks, then it’s all my fault. Then I thought its good that I’m doing on a werewolf/vampire movie. Do I really want do that? Once I started doing it, it felt like the action movie I wanted to do. And I had such a lovely time doing it that it sort of became beside the point whether it did well or not because it was such an important experience for me.”

She got quite the collection of bruises while filming though. “So many. No broken bones, but a lot of bruises. A lot of funky-looking kind of hickey things from the harness, because you have it on all day, and it kind of squeezes you. You have long big red blood vessels all over you. It becomes a badge of honor though. I think it’s that thing that actors who normally have a little bit of drama if they break a nail. You now start to think, ‘I’m getting injured at work now. I’m getting injured and hurting myself and suffering. It means I have to be very tough.’ Scott and I would compare our injuries. I think I had more hickeys, but he had actual cuts. He got dragged along the floor.”

Kate says she’s very happy with how the movie turned out. “When you see how it’s lit, how they added sound effects on it and all that kind of stuff, it’s kind of amazing.” It sure is, leaving only one question left to ask - would she do a sequel? “Oh yeah, I really enjoy playing this character. I really did. It would be fun.”