Guest Stars Bruce Greenwood voices Batman Troy Baker voices Brion Markov / Geo Force Grey DeLisle Griffin voices Helga Jace Jason Marsden voices Bart Allen / Kid Flash / Impulse Alyson Stoner voices Barbara Gordon / Oracle James Arnold Taylor voices G. Gordon Godfrey Stephanie Lemelin voices Computer Nolan North voices Superman / Clark Kent Mae Whitman voices Wonder Girl Crispin Freeman voices Gregor Markov Crispin Freeman voices Will Harper / Red Arrow Maggie Q voices Diana Prince / Wonder Woman Nolan North voices Frederick DeLamb / Baron Bedlam Steve Blum voices Henchy Masasa Moyo voices Cat Grant Troy Baker voices Simon Ecks Vanessa Marshall voices Black Canary Denise Boutte voices Lynn Stewart-Pierce Alan Tudyk voices Green Arrow Grey DeLisle Griffin voices Ana Von Furth / Plasma Jacqueline Obradors voices Alanna Bruce Greenwood voices Viktor Markov Vanessa Marshall voices Ilona Delamb-Markov