Zac Efron stars as infamous American serial killer Ted Bundy in the trailer for his new movie "Extremely Wicked, Shockingly Evil and Vile," which recently premiered at the Sundance Film Festival. Efron told Variety that he did cardio exercises and used a stationary cycle every morning for an hour in order to achieve the "wiry" physique that Bundy had in the '70s. He also lost 13 pounds by avoiding carbs and relying on a plant-based diet. In addition, the actor wore fake teeth for his bottom row, spoke to people who knew Bundy, and spent two weeks in an abandoned prison.