Sam Liu Director Melissa Rauch Harley Quinn Voice Kevin Conroy Batman , Bruce Wayne Voice Paget Brewster Poison Ivy Voice Robin Atkin Downes Rhino Voice John DiMaggio Sarge Steel Voice Kevin Michael Richardson Floronic Man , Jason Woodrue Voice Loren Lester Nightwing , Dick Grayson Voice Rob Paulsen Harold Goldblum Voice Mindy Sterling Project Supervisor Voice Trevor Devall Bobby Liebowitz Voice Eric Bauza Wesley Voice James Krieg Screenwriter Bruce Timm Screenwriter, Executive Producer Wes Gleason Executive Producer, Casting Benjamin Melniker Executive Producer Sam Register Executive Producer Andrea Romano Executive Producer Michael E. Uslan Executive Producer Christopher D. Lozinski Film Editing