- Eric Roberts - Mongul (voice)
- Mike Farrell - Jonathan Kent / Brainiac (voice)
- Josh Hutcherson - Van-El / Young Bruce Wayne (voice)
- Christopher McDonald - Jor-El (voice)
- Dakota Fanning - Kid Wonder Woman (voice)
- Marc John Jefferies - Kid Green Lantern (voice)
- Olivia d'Abo - Morgaine Le Fey (voice)
- Soren Fulton - Mordred (voice)
- Sheryl Lee Ralph - Cheetah (voice)
- Ashley Edner - May (voice)
- Jose Yenque - Copperhead (voice)
- Fred Savage - Hawk / Hank Hall (voice)
- Jason Hervey - Dove / Don Hall (voice)
- Michael York - Ares / Mr. Sera (voice)
- Patrick Bauchau - Kasnian Monk (voice)
- James Sie - General Kwan (voice)
- James Sie - Wind Dragon (voice)
- James Arnold Taylor - Private / Robber (voice)
- Rachel York - Circe (voice)
- Jack Carter - Sid (voice)
- Laraine Newman - Medusa (voice)
- Chad Einbinder - Attendant (voice)
- James Tucker - B'wana Beast (growling) (voice)
- Charles Napier - General Hardcastle (voice)
- Sam McMurray - Gilbert Hale (voice)
- Roger Rose - Lasser (voice)
- Cree Summer - Female Singer (voice)
- Tom Everett Scott - Booster Gold (voice)
- Billy West - Skeets (voice)
- Lori Loughlin - Tracy (voice)
- Jeremy Piven - Elongated Man (voice)
- Kath Soucie - Young Boy (voice)
- Ed O'Ross - General Olanic (voice)
- Ed O'Ross - Tobias Manning / Guard (voice)
- Dee Bradley Baker - Blockbuster (voice)
- Dee Bradley Baker - Woof (voice)
- Robert Picardo - Amazo (voice)
- Bruce Timm - Solomon Grundy (voice)
- Bruce Timm - Husband (voice)
- Peter Onorati - War Hawk (voice)
- Peter Onorati - B'wana Beast (voice)
- Gregg Rainwater - Long Shadow / Mike (voice)
- Tim Matheson - Maxwell Lord (voice)
- Ed Asner - Hephaestus (voice)
- Ed Asner - Granny Goodness (voice)
- Grey DeLisle - Downpour / Shifter (voice)
- Cathy Cavadini - Katie (voice)
- Dana Delany - Lois Lane (voice)
- Dana Delany - Loana (voice)
- Ben Browder - Bat Lash (voice)
- Jonathan Ross - Sheriff Ohiyesa Smith (voice)
- Nestor Carbonell - El Diablo (voice)
- Peter MacNicol - David Clinton (voice)
- Mindy Sterling - Enid (voice)
- Melissa Joan Hart - Dee Dee (voice)
- Adam Baldwin - Rick Flagg (voice)
- Adam Baldwin - Bonk (voice)
- Adam Baldwin - Jonah Hex (voice)
- Don Harvey - Chucko (voice)
- Jennifer Hale - Inza (voice)
- Jennifer Hale - Killer Frost (voice)
- Jennifer Hale - Giganta (voice)
- Jennifer Hale - Zatanna (voice)
- Will Friedle - Kyle Rayner (voice)
- Will Friedle - Batman (voice)
- Will Friedle - Terry McGinnis (voice)
- Ioan Gruffudd - Mr. Miracle (voice)
- Farrah Forke - Big Barda (voice)
- Arte Johnson - Virman Vundabar (voice)
- Michael Dorn - Kalibak (voice)
- Dick Miller - Oberon (voice)
- Zack Shada - Young Scott (voice)
- Jamie Alcroft - Vance (voice)
- Jamie Alcroft - Larry (voice)
- Michael Jai White - Doomsday (voice)
- Armin Shimerman - Dr. Milo (voice)
- John C. McGinley - The Atom (voice)
- John C. McGinley - The Atom / Ray Palmer (voice)
- Alan Rachins - Clock King (voice)
- Robert Englund - Felix Faust (voice)
- Lex Lang - Atomic Skull (voice)
- Lex Lang - Captain Cold (voice)
- Lex Lang - Thug Leader (voice)
- Lex Lang - Nardoc / Angry Patron (voice)
- Lex Lang - Robber #1 (voice)
- Lex Lang - Heatwave (voice)
- Bob Joles - Hades (voice)
- Jason Bateman - Hermes (voice)
- Wayne Knight - Abnegazar (voice)
- CCH Pounder - Amanda Waller (voice)
- CCH Pounder - Amanda Waller / Juice (voice)
- Susan Sullivan - Hippolyta (voice)
- Michael T. Weiss - Jason Blood (voice)
- Glenn Shadix - Mondragora (voice)
- Scott Paterson - Faraday (voice)
- Joe Nipote - Tony (voice)
- Steve Schirripa - Cecil (voice)
- Jerry O'Connell - Captain Marvel (voice)
- Lisa Edelstein - Mercy (voice)
- Elizabeth Peña - Paran-Dul (voice)
- David Barrera - Hawk #2 (voice)
- Robert Foxworth - Professor Hamilton (voice)
- Dennis Farina - Wildcat (voice)
- Corey Burton - Brainiac (voice)
- Michael Rosenbaum - The Flash (voice)
- Michael Rosenbaum - Deadshot (voice)
- Michael Rosenbaum - Ghoul (voice)
- Robert Forster - The President (voice)
- Hynden Walch - Ace (voice)
- Marc Worden - Parasite (voice)
- Seymour Cassel - Chuck Sirianni (voice)
- Chris Cox - Captain Atom (voice)
- Chris Cox - Shining Knight (voice)
- Takayo Fischer - Mairzey (voice)
- Michael Beach - Mr. Terrific (voice)
- Michael Beach - Devil Ray (voice)
- Michael Beach - Commander (voice)
- John DiMaggio - Dreamslayer (voice)
- Paul Guilfoyle - Travis Morgan (voice)
- Malcolm McDowell - Metallo (voice)
- Douglas Dunning - Deimos (voice)
- Nicholas Guest - Dino Trooper (voice)
- Scott Patterson - Agent Faraday (voice)
- Ron Perlman - Orion (voice)
- J.K. Simmons - General Eiling (voice)
- J.K. Simmons - Eiling (voice)
- Mark Hamill - Trickster (voice)
- Donal Gibson - Captain Boomerang (voice)
- Alexis Denisof - Mirror Master (voice)
- Hector Elizondo - Hath-Set (voice)
- Hector Elizondo - Kragger (voice)
- Lani Minella - Mayor (voice)
- Raphael Sbarge - Deadman (voice)
- David Ogden Stiers - Solovar (voice)
- Sab Shimono - Monk (voice)
- Juliet Landau - Tala (voice)
- Juliet Landau - Plastique (voice)
- Nicholle Tom - Supergirl (voice)
- Nicholle Tom - Kara / Tea (voice)
- Nicholle Tom - Supergirl / Kara (voice)
- James Remar - Carter Hall (voice)
- James Remar - Hawkman / Shadow Thief (voice)
- Kin Shriner - Green Arrow (voice)
- Nathan Fillion - Vigilante (voice)
- Giselle Loren - Stargirl (voice)
- Mike Erwin - Speedy (voice)
- Tara Strong - Johnny (voice)
- Jeff Bennett - Rick Wilson (voice)
- Oded Fehr - Dr. Fate (voice)
- Ted Levine - Sinestro (voice)
- Morena Baccarin - Black Canary (voice)
- Maria Canals-Barrera - Shayera Hol (voice)
- Maria Canals-Barrera - Hawkgirl (voice)
- Maria Canals-Barrera - Fire (voice)
- Virginia Madsen - Roulette (voice)
- Amy Acker - The Huntress (voice)
- Kim Mai Guest - Linda Park (voice)
- Kim Mai Guest - Silver Banshee (voice)
- Jeffrey Combs - The Question (voice)
- Matt Czuchry - Brainiac 5 (voice)
- Googy Gress - Bouncing Boy (voice)
- Tomas Arana - Tharok (voice)
- Joanne Whalley - Emerald Empress (voice)
- Gina Torres - Vixen (voice)
- Lauren Tom - Dana (voice)
- Lauren Tom - Dr. Light (voice)
- Robin Atkin Downes - Gentleman Ghost (voice)
- Robin Atkin Downes - Watchtower Ops Tech (voice)
- Powers Boothe - Gorilla Grodd (voice)
- Bud Cort - Toyman (voice)
- Daniel Dae Kim - Metron (voice)
- Clancy Brown - Lex Luthor (voice)
- Michael Ironside - Darkseid (voice)
- George Eads - Captain Atom (voice)
- Jerry Siegel
- Joe Shuster
- Gardner Fox
- Bob Kane
- William Moulton Marston
Don Harvey interpreta a Chucko (voice) en la serie.
Mark Hamill hace el papel de Trickster (voice).
Adam Baldwin hace el papel de Rick Flagg (voice).
Ron Perlman hace el papel de Orion (voice).
Michael Dorn interpreta a Kalibak (voice) en la serie.
Christopher McDonald hace el papel de Jor-El (voice).
Dennis Farina interpreta a Wildcat (voice) en la serie.
Wayne Knight interpreta a Abnegazar (voice) en la serie.
Robert Foxworth hace el papel de Professor Hamilton (voice).
Paul Guilfoyle interpreta a Travis Morgan (voice) en la serie.
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