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 Stephanie Lemelin voices Computer James Arnold Taylor voices G. Gordon Godfrey Nolan North voices Superman / Clark Kent Mae Whitman voices Wonder Girl Crispin Freeman voices Will Harper / Red Arrow Crispin Freeman voices Gregor Markov Steve Blum voices Henchy Nolan North voices Frederick DeLamb / Baron Bedlam Maggie Q voices Diana Prince / Wonder Woman 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 Jacqueline Obradors voices Alanna Grey DeLisle Griffin voices Ana Von Furth / Plasma Bruce Greenwood voices Viktor Markov Vanessa Marshall voices Ilona Delamb-Markov