- Gary Anthony Williams - Michael Holt (voice)
- Laraine Newman - Diner Owner (voice)
- Ian James Corlett - Joe Braxton / Police Officer (voice)
- Arif S. Kinchen - Daedalus Boch (voice)
- Carlos Alazraqui - Junkyard Dog (voice)
- Matthew Mercer - Ice Pick Joe (voice)
- Cree Summer - Bethanie Ravencroft (voice)
- James Arnold Taylor - William Benjamin / Officer Dunbrowski / Subway Conductor (voice)
- Dee Bradley Baker - Mutant Ninjas 1 & 2 (voice)
- Greg Ellis - Phosphorous Rex / Milo Match (voice)
- Greg Ellis - Phosphorous Rex (voice)
- Gary Anthony Sturgis - Guard (voice)
- Abraham Benrubi - Street Thug (voice)
- James Remar - Silver Monkey (voice)
- James Remar - Silver Monkey / Mr. Reese (voice)
- Matthew Lillard - Dr. Jason Burr (voice)
- Jason Marsden - Young Bruce Wayne (voice)
- Jeff Bennett - Simon Stagg (voice)
- Jeff Bennett - Simon Stagg / Store Owner / Thug #2 (voice)
- Paul Nakauchi - Edogawa Yamashiro (voice)
- Michael Patrick McGill - Officer O'Brien (voice)
- Michael Patrick McGill - Officer O'Brien / Thug (voice)
- Grey DeLisle - Magpie / Margaret Sorrow (voice)
- Lance Reddick - Ra's Al Ghul (voice)
- Carlos Ferro - Police Commissioner / Officer Rodriguez (voice)
- Finola Hughes - Lady Shiva (voice)
- Brian George - Professor Pyg (voice)
- Brian George - Professor Pyg / Liam Taylor (voice)
- Emmanuelle Chriqui - Sapphire Stagg (voice)
- Matt Jones - Humpty Dumpty / Humphrey Dumpler (voice)
- CCH Pounder - Mayor Marion Grange (voice)
- Michael-Leon Wooley - Tobias Whale (voice)
- Michael-Leon Wooley - Matatoa / Tobias Whale (voice)
- Udo Kier - Mister Toad (voice)
- Tara Strong - Barbara Gordon (voice)
- Tara Strong - Oracle / Barbara Gordon (voice)
- Tara Strong - Barbara Gordon / Woman (voice)
- Tara Strong - Barbara Gordon / Female Reporter (voice)
- Tara Strong - Barbara Gordon / Detective Marcie Brown (voice)
- Wallace Langham - Anarky / Lonnie Machin (voice)
- Wallace Langham - Anarky / Lonnie Machin / Thug #1 (voice)
- Wallace Langham - Anarky / Lonnie Machin / Weapons Buyer (voice)
- Xander Berkeley - Manhunter / Paul Kirk (voice)
- Tisha Terrasini Banker - Ava Kirk / Gloria Pearce (voice)
- Tisha Terrasini Banker - Ava Kirk (voice)
- Bruce Thomas - Dr. Anatol Mykros (voice)
- Wade Williams - Killer Croc / Waylon Jones (voice)
- Wade Williams - Ernie Croskey (voice)
- Robin Atkin Downes - Dane Lisslow / Heavy Hitter Thug (voice)
- Robin Atkin Downes - Bad Batman / Dane Lisslow / Police Officer (voice)
- Robin Atkin Downes - Deathstroke / Slade Wilson (voice)
- Robin Atkin Downes - Dane Lisslow / Deathstroke / Chuck (voice)
- Robin Atkin Downes - Dane Lisslow / Man-Bat / Kirk Langstrom (voice)
- Robin Atkin Downes - Deathstroke / Slade Wilson / Man-Bat / Kirk Langstrom (voice)
- Yuri Lowenthal - Creed Courtman / Detective Thomas (voice)
- Adam Baldwin - Metamorpho / Rex Mason (voice)
- Christopher McDonald - Harvey Dent (voice)
- Christopher McDonald - Harvey Dent / Weapons Seller (voice)
- James Patrick Stuart - David Hull / Mercenery (voice)
- Beth Tapper - Jocelyn Kilroy (voice)
- Andrea Romano
- Glen Murakami
- Sam Register
Adam Baldwin hace el papel de Metamorpho / Rex Mason (voice).
Christopher McDonald interpreta a Harvey Dent / Weapons Seller (voice) en la serie.
Udo Kier interpreta a Mister Toad (voice) en la serie.
Xander Berkeley hace el papel de Manhunter / Paul Kirk (voice).
Greg Ellis interpreta a Phosphorous Rex (voice) en la serie.
James Remar interpreta a Silver Monkey (voice) en la serie.
Anthony Ruivivar interpreta a Bruce Wayne / Batman (voice) en la serie.
JB Blanc interpreta a Alfred Pennyworth (voice) en la serie.
Sumalee Montano interpreta a Katana / Tatsu Yamashiro (voice) en la serie.
Kurtwood Smith interpreta a Lieutenant James Gordon (voice) en la serie.
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