Kevin Conroy Batman / Bruce Wayne (voice) Melissa Rauch Harley Quinn (voice) Loren Lester Nightwing / Dick Grayson (voice) Paget Brewster Pamela Isley / Poison Ivy (voice) Kevin Michael Richardson Floronic Man / Jason Woodrue (voice) John DiMaggio Dr. Alec Holland / Swamp Thing (voice) / Sarge Steel (voice) Trevor Devall Bobby Liebowitz (voice) Eric Bauza Wesley (voice) Robin Atkin Downes Rhino (voice) Rob Paulsen Harold Goldblum (voice) Mindy Sterling Project Supervisor (voice) Bruce Timm Booster Gold (voice)