Helena Bonham Carter won't reveal too much about her character in Terminator Salvation, but did she tell Sci-Fi Wire that Serena will be a villain.

"I kind of play a baddie, definitely a baddie," Bonham Carter said. "I don't know how much I'm allowed to say, but I'm a very bad person."

The actress added that she was pushed into the role by long-time boyfriend, director Tim Burton.

"Tim would have killed me if I hadn't done it, because he's such a Terminator fan. I've been in big movies before... Fight Club was big in a different way, and Charlie [and the Chocolate Factory] and Sweeney Todd were big, but I've never been in this kind of big popcorn action movie, a male one, an action one."