Cyclops / Scott Summers (50 episodes, 2000-2003)
Jean Grey / Riley Finn (46 episodes, 2000-2003)
Kurt Wagner / Nightcrawler (47 episodes, 2000-2003)
Professor Charles Xavier / Apocalypse / En Sabah Nur / Sgt. Hawk (45 episodes, 2000-2003)
Kitty Pryde / Shadowcat / Reporter (41 episodes, 2000-2003)
Logan / Wolverine / Additional Voices / Police Officer / Soldier (39 episodes, 2000-2003)
Rogue (35 episodes, 2000-2003)
Ororo Munroe / Storm / Mrs. Warren (31 episodes, 2000-2003)
Evan Daniels / Spyke (29 episodes, 2000-2003)
Toad / Todd Tolensky (24 episodes, 2000-2003)
Avalanche / Lance Alvers (20 episodes, 2000-2003)
Blob / Fred Dukes / Caliban (20 episodes, 2000-2003)
Iceman / Robert 'Bobby' Drake / Bobby Drake (17 episodes, 2001-2003)
Beast / Dr. Henry 'Hank' McCoy (21 episodes, 2001-2003)
Mystique / Raven Darkholme (19 episodes, 2000-2003)
Pietro Maximoff / Quicksilver (18 episodes, 2000-2003)
Magneto / Magnus (17 episodes, 2000-2003)
Amara Aquilla / Magma (8 episodes, 2001-2003)
Sabretooth / Victor Creed / The President / Briefing Officer (13 episodes, 2000-2003)
Berzerker / Ray Crisp (8 episodes, 2001-2003)
Boom Boom / Tabitha Smith (11 episodes, 2001-2003)
Principal Edward Kelly (9 episodes, 2001-2003)
Scarlet Witch / Wanda Maximoff (8 episodes, 2002-2003)
Jamie Madrox / Multiple / Multiple Man (7 episodes, 2001-2003)
Risty Wilde (9 episodes, 2001-2002)
Cain Marko / Juggernaut / Egyptian Man / Frank Lee / Hunter / Scientist / Train Intercom Voice (7 episodes, 2001-2003)
Duncan Matthews (7 episodes, 2000-2003)
Cannonball / Samuel Guthrie (8 episodes, 2001-2003)
John Allerdyce / Pyro / Captain Stone / Additional Voices (7 episodes, 2001-2003)
Alex Masters / Havok (6 episodes, 2001-2003)
Taryn / Sydney White (3 episodes, 2000-2002)
Nick Fury (6 episodes, 2002-2003)
Gambit / Remy LeBeau (5 episodes, 2002-2003)
Jubilation Lee / Jubilee / Daughter (4 episodes, 2001-2002)
Sunspot / Roberto 'Bobby' DaCosta / Bobby DaCosta (4 episodes, 2001-2003)
Mesmero / Congressman (5 episodes, 2002-2003)
Colossus / Piotr Rasputin (3 episodes, 2002-2003)
Rahne Sinclair / Wolfsbane (3 episodes, 2001-2002)
Forge / Cody / Paul (3 episodes, 2000-2002)
Amanda Sefton (3 episodes, 2000-2002)
Hunter (3 episodes, 2002-2003)
Jason Wyngarde / Mastermind / Professor Thorton (3 episodes, 2001-2002)
Arkady Rossovich / Dr. Emirez / Mr. Rodetski / Omega Red / Security Officer (3 episodes, 2001-2003)
Angel / Warren Worthington III (3 episodes, 2001-2003)
Doctor Deborah Risman / Madame Hydra (2 episodes, 2003)
Guy Spear / Mr. Spear (2 episodes, 2002-2003)
Destiny / Irene Adler (2 episodes, 2000-2002)
Callisto (2 episodes, 2002-2003)
Chop-Shop Boss (2 episodes, 2002-2003)
Mirambo / Mr. Sefton (2 episodes, 2001-2002)
Agatha Harkness (2 episodes, 2002-2003)
Dr. Eaton (2 episodes, 2002-2003)
(2 episodes, 2002)
Lucid (2 episodes, 2002-2003)
Dr. Bolivar Trask (2 episodes, 2002)
Dorian Leech / Leech (1 episode, 2003)
Moira MacTaggart / Policewoman (2 episodes, 2002-2003)
Friendly Kid (1 episode, 2002)
Danielle Moonstar (1 episode, 2003)
(1 episode, 2003)
The Hungan (1 episode, 2001)
Jason (1 episode, 2001)
Arcade / Webber Torque (1 episode, 2001)
Gauntlet (1 episode, 2003)
Mr. Smith (1 episode, 2001)
X23 (1 episode, 2003)
Helicopter Pilot (1 episode, 2001)
David Haller / Lucas (1 episode, 2003)
Margali Sefton (1 episode, 2002)
Professor (1 episode, 2002)
Mrs. Leech (1 episode, 2003)
Angry Woman (1 episode, 2003)
Crowd Member #5 (1 episode, 2001)
Crowd Member #1 / Doctor / Man (1 episode, 2001)
Teenage Blonde Hair Girl (1 episode, 2001)
Crowd Member #4 / Jaime's Mother / Nurse / Teenage Orange Hair Girl (1 episode, 2001)
Crowd Member #3 / Mugger (1 episode, 2001)
News Reporter / Woman entering the Worthington Tower (1 episode, 2001)
Policeman / Truck Driver (1 episode, 2001)
News Achor (1 episode, 2001)
Firefighter / Radio Announcer (1 episode, 2001)
Crowd Member #6 (1 episode, 2001)
Crowd Member #2 (1 episode, 2001)
Daughter's Father (1 episode, 2001)
Angel's Mother (1 episode, 2001)
Daughter's Mother (1 episode, 2001)
Roberto DaCosta / Sunspot (uncredited) (1 episode, 2001)
(uncredited) (1 episode, 2001)