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