2 - FILM NEWS Mariah Carey Not Commissioner Gordon, Will Play Gotham’s Mayor In “Lego Batman” November 9, 2015 0 Carey proves a worthwhile addition to an already incredible voice cast consisting of Will Arnett as Batman, Michael Cera as Robin, Rosario Dawson as Batgirl, Ralph Fiennes as Alfred, and Zach Galifianakis as The Joker.