
| Debi Derryberry | ... | James Isaac 'Jimmy' Neutron (52 episodes, 2002-2006) |
 | Rob Paulsen | ... | Carl Wheezer / ... (15 episodes, 2002-2006) |

| Frank Welker | ... | Goddard / ... (13 episodes, 2002-2006) |

| Candi Milo | ... | Nick Dean / ... (12 episodes, 2002-2006) |

| Mark DeCarlo | ... | Hugh Beaumont Neutron / ... (12 episodes, 2002-2006) |
 | Jeffrey Garcia | ... | Sheen Estevez (11 episodes, 2002-2006) |

| Crystal Scales | ... | Libby Fallfax / ... (11 episodes, 2002-2006) |
 | Megan Cavanagh | ... | Judy Neutron (9 episodes, 2002-2006) |

| Andrea Martin | ... | Ms. Fowl (9 episodes, 2002-2006) |

| Carolyn Lawrence | ... | Cindy Vortex (7 episodes, 2002-2006) |
 | Jeff Bennett | ... | Barbarino / ... (6 episodes, 2003-2006) |
 | Tom Kenny | ... | Nanobot #2 / ... (5 episodes, 2002-2005) |

| Tim Curry | ... | Professor Finbarr Calamitous / ... (5 episodes, 2003-2005) |

| Phil LaMarr | ... | Bolbi Stroganofsky / ... (4 episodes, 2004-2006) |

| Paul Greenberg | ... | Brobot / ... (4 episodes, 2002-2005) |
 | Jim Cummings | ... | Atilla the Hun / ... (4 episodes, 2003-2006) |

| Maurice LaMarche | ... | Zia / ... (4 episodes, 2003-2006) |

| Kevin Michael Richardson | ... | Tee / ... (4 episodes, 2003-2006) |
 | Billy West | ... | Sam Melnick (4 episodes, 2003-2004) |
 | Daran Norris | ... | Nanobot #1 (3 episodes, 2002-2005) |

| Corey Burton | ... | Head Monk / ... (3 episodes, 2003-2006) |
 | Kath Soucie | ... | Betty Quinlan / ... (3 episodes, 2003-2006) |

| Wendie Malick | ... | Beautiful Gorgeous (3 episodes, 2003-2005) |
 | Graystar | ... | Tall Elementary Students (3 episodes, 2005-2006) |

| James Belushi | ... | Coach Gruber (2 episodes, 2002-2006) |
 | Phyllis Diller | ... | Grandma Neutron / ... (2 episodes, 2002-2004) |
 | S. Scott Bullock | ... | King Goobot (2 episodes, 2003-2005) |

| Michael Clarke Duncan | ... | Commander Baker (2 episodes, 2003-2005) |

| Christian Slater | ... | Jet Fusion (2 episodes, 2003-2005) |
 | Charles Adler | ... | Junkman (2 episodes, 2004-2005) |

| Edie McClurg | ... | Grandma Taters (2 episodes, 2005-2006) |

| Tom Kane | ... | Dean Cain (2 episodes, 2005) |
|
| Todd Harper | .... | texture & shading artist / texture artist (35 episodes, 2002-2006) |
| Scott Lemmer | .... | character animator (35 episodes, 2002-2006) |
| Steve Kolbe | .... | layout supervisor (31 episodes, 2002-2004) |
| Ryan Michero | .... | head of texture (24 episodes, 2002-2005) |
| Sara Jane Kramer | .... | texture & shading artist (23 episodes, 2003-2006) |
| Ian Megibben | .... | lighting supervisor / head of lighting (22 episodes, 2002-2004) |
| Christopher Lee Fowler | .... | digital artist (21 episodes, 2003-2006) |
| Tommy Wright | .... | lighting artist (20 episodes, 2003-2006) |
| Kirby Atkins | .... | character animator (11 episodes, 2002-2003) |
| Sean Ermey | .... | character animator (8 episodes, 2003-2006) |
| Aaron Thedford | .... | texture artist (5 episodes, 2002-2005) |
| Charles Tinney | .... | character animator (4 episodes, 2006) |
| Matthew Tardiff | .... | character animator (3 episodes, 2005-2006) |
| Hyun Chul Jung | .... | character animator (2 episodes, 2005) |
| Barry Rooney | .... | animator (2 episodes, 2005) |
|
| Brian Capshaw | .... | character animator (unknown episodes) |
| Juan Carlos Navarro Carrion | .... | character animator (unknown episodes) |
| Pei Cheng | .... | lighting artist (unknown episodes) |
| Jerod Chirico | .... | character animator (unknown episodes) |
| Youngjae Choi | .... | character animator (unknown episodes) |
| Kent Culotta | .... | character animator (unknown episodes) |
| Andrea Davis | .... | character animator (unknown episodes) |
| Ryan Davis | .... | character animator (unknown episodes) |
| Alexander Fleisig | .... | character animator (unknown episodes) |
| Rena M. Fowler | .... | character animator (unknown episodes) |
| Michelle Gorski | .... | character animator (unknown episodes) |
| Tom Grevera | .... | supervising animator: "Jimmy", "Libby", "Judy", and "Nick" (unknown episodes) |
| Audie Harrison | .... | character animator (unknown episodes) |
| Beau Hawkins | .... | character set-up supervisor (unknown episodes) |
| Michael Higgins | .... | character animator (unknown episodes) |
| Joseph P. Johnston | .... | layout artist (unknown episodes) |
| Tom M. Jordan | .... | character modeling supervisor (unknown episodes) |
| Sarah Mensinga | .... | character animator (unknown episodes) |
| Brian Menz | .... | character animator (unknown episodes) |
| Deanna Molinaro | .... | character animator (unknown episodes) |
| Brett Paton | .... | character animator (unknown episodes) |
| Matthew Russell | .... | supervising animator: "Cindy", "Carl", "Sheen", "Hugh", and "Ms. Fowl" (unknown episodes) |
| Augusto Schillaci | .... | lighting artist (unknown episodes) |
| Ray Sena | .... | texture artist (unknown episodes) |
| Aaron Werntz | .... | character animator (unknown episodes) |
| |
|
| Ray Chase | .... | character animator (25 episodes, 2002-2006) |
| Tom Grevera | .... | supervising animator (21 episodes, 2002-2004) |
| Youngjae Choi | .... | character animator (15 episodes, 2003-2006) |
| Tom Saville | .... | character animator / animator (14 episodes, 2002-2004) |
| Mark Thielen | .... | animator (14 episodes, 2002-2004) |
| Shannon Pytlak | .... | animator (6 episodes, 2004-2006) |
| Shane L. Wapskineh | .... | layout artist (4 episodes, 2002) |
| Charles Tinney | .... | animator (4 episodes, 2005-2006) |
| Amila Puhala | .... | animator (4 episodes, 2006) |
| Patrik Puhala | .... | animator (3 episodes, 2005-2006) |
|
| Keith Alcorn | .... | character designer (unknown episodes) |
| Andrew Burke | .... | animator (unknown episodes) |
| Mike Gasaway | .... | animator (unknown episodes) |
| Joe Gorski | .... | animator (unknown episodes) |
| David Rasura | .... | layout artist (unknown episodes) |
| Mike Wallace | .... | layout artist (unknown episodes) |
| |