Lego Batman Movie Trailer Review Cast: Will Arnett as Bruce Wayne / Batman | Zach Galifianakis as The Joker | Michael Cera as Dick Grayson / Robin | Rosario Dawson as Barbara Gordon / Batgirl | Ralph Fiennes as Alfred Pennyworth | Mariah Carey as Mayor McCaskill | Jenny Slate as Dr. Harleen Quinzel / Harley... Read More →