Aaron Eckhart, who plays Gotham City district attorney Harvey Dent in the upcoming
The Dark Knight, told reporters that his character undergoes a major transformation when faced with the villainous Joker (the late Heath Ledger).
"The Joker really is the engine that is pushing everyone's buttons and pushing the ... action forward," Eckhart said in a group interview last week in Beverly Hills, Calif. "He's asking all the questions, and we, as the other characters, have to answer them."