Bruce Greenwood Bruce Wayne / Batman (voice) Jensen Ackles Jason Todd / Red Hood (voice) Neil Patrick Harris Dick Grayson / Nightwing (voice) Jason Isaacs Ra's al Ghul (voice) John DiMaggio Joker (voice) Wade Williams Black Mask (voice) Carlos Alazraqui Chi Chi / Thug #1 / Baton (voice) Robert Clotworthy Leon / Thug (voice) Gary Cole Bobo / Commissioner Gordon / Shot / Guard (voice) Brian George Ra's Assistant (voice) Kelly Hu Ms. Li (voice) Phil LaMarr Rick / Bulk (voice) Vincent Martella Robin / Jason Todd (voice) Jim Piddock Alfred Pennyworth (voice) Kevin Michael Richardson Tyler Bramford (voice) Andrea Romano Reporter #1 (voice) Dwight Schultz Freddie / Drug Dealer (voice) Fred Tatasciore Mercenary #1 / Amazo / Guard (voice) Bruce Timm The Riddler (voice)