Cam Gigandet plays an evil vampire in 'Twilight' -- and he tells us how he feels about his character in our all-new video!

Cam tells ET in an all-new interview that he was actually originally cast in the role of fun-loving good vamp Emmett -- but he liked the role of James so much that he pitched himself to director Catherine Hardwicke for the role -- and she said yes!

He says of his character, "He's true to who he is, you know I mean vampires they bite humans and suck blood, whatever."

Watch our video for more with Cam on 'Twilight,' which hits theaters on Friday, November 21! Also, click here for an interview with Robert Pattinson, and here to hear what Kristen Stewart has to say about 'Twilight.'