"He's one of those great villains that an actor like me likes to play because he has layers - he has a face for the world and a face for himself," Emerson says of the Joker. "He is, in a way, a villain who is a natural actor. All of that is that is delightful and confounding at the same time. It's freeing because of the largeness of it. When he laughs, there's nothing subdued about it. When he screams in rage, there's nothing controlled about it. The amp is turned to 11 at all times."