<Li> Will Arnett as Bruce Wayne / Batman, a superhero from Gotham City . </Li> <Li> Zach Galifianakis as The Joker, Batman's archenemy who is the "Clown Prince of Crime ." </Li> <Li> Michael Cera as Dick Grayson / Robin, an orphan who is adopted by Bruce Wayne . </Li> <Li> Rosario Dawson as Barbara Gordon / Batgirl, a police officer who becomes the new police commissioner . </Li>

Who voices robin in the lego batman movie