
| Olivia Hack | ... | Rhonda Wellington Lloyd / ... (41 episodes, 1996-2002) |

| Toran Caudell | ... | Arnold / ... (33 episodes, 1996-2001) |

| Phillip Van Dyke | ... | Arnold / ... (30 episodes, 1997-2000) |
 | Francesca Smith | ... | Helga Pataki / ... (28 episodes, 1996-2000) |
 | Spencer Klein | ... | Arnold (III) / ... (27 episodes, 1999-2002) |
 | Craig Bartlett | ... | Brainy / ... (11 episodes, 1996-2003) |

| Jamil Walker Smith | ... | Gerald Martin Johanssen / ... (10 episodes, 1996-1998) |
 | Christopher Walberg | ... | Stinky / ... (10 episodes, 1996-1999) |
 | Anndi McAfee | ... | Phoebe Heyerdahl / ... (9 episodes, 1997-1999) |

| Justin Shenkarow | ... | Harold / ... (9 episodes, 1996-1999) |

| Dan Castellaneta | ... | Grandpa / ... (8 episodes, 1996-1999) |
 | Kath Soucie | ... | Miriam / ... (8 episodes, 1996-1999) |
 | Sam Gifaldi | ... | Sid (7 episodes, 1996-1998) |
 | Steve Viksten | ... | Oskar Kokosha / ... (7 episodes, 1996-1999) |
 | Danica Ivancevic | ... | Hospitalized Woman / ... (7 episodes, 1996-2000) |
 | Baoan Coleman | ... | Mr. Hyunh (6 episodes, 1996-1999) |

| Maurice LaMarche | ... | Big Bob / ... (6 episodes, 1996-1999) |
 | Ben Diskin | ... | Eugene Horowitz / ... (5 episodes, 1997-2000) |
 | Dan Butler | ... | Mr. Simmons (5 episodes, 1997-1999) |
 | Dom Irrera | ... | Ernie Potts / ... (5 episodes, 1996-1999) |
 | David Wohl | ... | Principal Wartz / ... (5 episodes, 1997-1999) |

| Marcus Toji | ... | Park / ... (5 episodes, 1996-1998) |
 | Carlos Alazraqui | ... | Carlos / ... (5 episodes, 1996-2002) |

| John Mariano | ... | Morrie / ... (5 episodes, 1996-2002) |
 | Avriel Epps | ... | Timberly (5 episodes, 1996-1999) |

| Lori Alan | ... | Brooke Lloyd / ... (5 episodes, 1997-2001) |
 | Tress MacNeille | ... | Additional Voices / ... (4 episodes, 1996-1998) |
 | Adam Wylie | ... | Curly / ... (4 episodes, 1997-1999) |
 | Mary Scheer | ... | Suzie Kokoshka / ... (4 episodes, 1997-1998) |
 | Jarrett Lennon | ... | Eugene / ... (4 episodes, 1996-1997) |

| James Belushi | ... | Coach Wittenberg (4 episodes, 1996-1999) |

| Lisa Fuson | ... | Danny's Mother / ... (4 episodes, 1996-2000) |

| Tony Jay | ... | Rex Smythe-Higgins / ... (4 episodes, 1996-1999) |
 | Michael Bacall | ... | Torvald / ... (4 episodes, 1996-1997) |
 | Joey Paul | ... | Mindy / ... (4 episodes, 1996-1997) |
 | Ashley Buccille | ... | Lila Sawyer / ... (3 episodes, 1997-1999) |
 | Lou Rawls | ... | Harvey (3 episodes, 1996-1999) |
 | Rick Corso | ... | Dino Spumoni (3 episodes, 1996-1999) |
 | Cathy Moriarty | ... | Tish Wittenberg (3 episodes, 1997-1999) |

| Maria Bamford | ... | Mayor Dixie / ... (3 episodes, 1998-1999) |

| Shari Belafonte | ... | Mrs. Johanssen (3 episodes, 1996-1997) |
 | Mary Gross | ... | School Nurse Shelley (3 episodes, 1997-2002) |
 | Sam McMurray | ... | Buckley Lloyd / ... (3 episodes, 1997-2001) |
 | Rick Fitts | ... | Martin Johanssen / ... (2 episodes, 1997) |
 | Tim Wiley | ... | Edmund (2 episodes, 1997-1998) |
 | Lauren Robinson | ... | Nadine (2 episodes, 1997-1998) |

| Laraine Newman | ... | Kid With Map / ... (2 episodes, 1999) |
 | Michael Levin | ... | Dino Spumoni / ... (2 episodes, 1999) |

| Harvey Korman | ... | Don Reynolds (2 episodes, 1997-1999) |

| Kathy Najimy | ... | Madame Blanche (2 episodes, 1997-1999) |

| Mayim Bialik | ... | Maria (2 episodes, 1996-1999) |
 | Pamela Hayden | ... | Connie (2 episodes, 1996-1999) |

| Ron Perlman | ... | Mickey Kaline / ... (2 episodes, 1996-1998) |
 | Elizabeth Ashley | ... | Mrs. Vitello (2 episodes, 1996-1997) |
 | Billy Riback | ... | Announcer / ... (2 episodes, 1996-1997) |
 | Caroline Aaron | ... | Landlady / ... (2 episodes, 1996) |
 | Frank Martorana | ... | Burt / ... (2 episodes, 1996) |

| Vincent Schiavelli | ... | Mr. Bailey / ... (2 episodes, 1996) |
 | John Rubano | ... | Doctor / ... (2 episodes, 1997-1999) |
 | Lloyd Sherr | ... | Tape Voice / ... (2 episodes, 1997-1999) |

| Elliott Gould | ... | Rabbi Goldberg (2 episodes, 1997-1998) |
 | Joey Stinson | ... | Rex Smythe-Higgins III (2 episodes, 1997-1998) |

| Lacey Chabert | ... | Ruth P. McDougal (2 episodes, 1997) |

| Joseph Ashton | ... | Iggy (2 episodes, 1998-2002) |
 | Gregg Berger | ... | Amusement Park Worker / ... (2 episodes, 1998) |

| Victor Lopez | ... | Lorenzo (2 episodes, 1998) |

| Bronson Pinchot | ... | Chauffeur / ... (2 episodes, 1998) |
 | Joe Lala | ... | Miller / ... (2 episodes, 1999-2002) |
 | Cameron Van Hoy | ... | 'Big' Gino (2 episodes, 1999-2002) |
 | Grant Hoover | ... | Arnie (2 episodes, 1999-2001) |
 | Antoinette Stella | ... | Arnold's Mother / ... (2 episodes, 2000-2002) |

| Alex D. Linz | ... | Arnold (2 episodes, 2002) |
|
 | Christopher Castile | ... | Eugene Horowitz (I) (unknown episodes, 1996) |
 | Blake McIver Ewing | ... | Eugene Horowitz (IV) (unknown episodes, 2001) |
 | Jordan Warkol | ... | Chocolate Boy (unknown episodes) |
|
| Melinda Rediger | .... | line producer (29 episodes, 1996-1997) |
| Craig Bartlett | .... | executive producer (13 episodes, 1996-2002) |
| Mary Harrington | .... | executive producer / executive producer: Nickelodeon (10 episodes, 1996-1999) |
| Steve Viksten | .... | co-producer (10 episodes, 1996-1999) |
| Joseph Purdy | .... | co-producer (8 episodes, 1997-2003) |
| Michael Lessa | .... | senior producer / line producer (6 episodes, 1996-2003) |
| Jamie Mitchell | .... | supervising producer (5 episodes, 1996-1997) |
| Kathrin Seitz | .... | supervising producer / supervising producer: Nickelodeon (5 episodes, 1996-1997) |
| Joe Ansolabehere | .... | co-producer (3 episodes, 1996-1997) |
| Donna Smith | .... | line producer (2 episodes, 1999-2002) |
| Steve Socki | .... | supervising producer (2 episodes, 1999) |
|
| Rachel Lipman | .... | co-producer / producer (unknown episodes, 1996-1997) |
| Paul C. Fabela | .... | line producer (unknown episodes, 1996) |
| Kelly Crews | .... | line producer (unknown episodes) |
| Michelle Lamoreaux | .... | co-producer (unknown episodes) |
| |
|
| Jay Lender | .... | storyboard artist (12 episodes, 1997-1999) |
| Clint Bond Jr. | .... | prop designer (11 episodes, 1996-1999) |
| Miyuki Hoshikawa | .... | assistant storyboard artist / storyboard artist (9 episodes, 1996-1999) |
| Chris Robertson | .... | storyboard artist / assistant storyboard artist (6 episodes, 1996-1998) |
| Tim Parsons | .... | assistant storyboard artist / storyboard artist / ... (6 episodes, 1997-2004) |
| Carson Kugler | .... | assistant storyboard artist / storyboard artist (6 episodes, 1997-1999) |
| Steve Lowtwait | .... | assistant storyboard artist / storyboard artist (6 episodes, 1997-1999) |
| Ted Seko | .... | assistant storyboard artist / storyboard artist (6 episodes, 1997-1999) |
| Tuck Tucker | .... | storyboard director / storyboard supervisor (5 episodes, 1996-2002) |
| Sherm Cohen | .... | assistant storyboard artist / storyboard artist / ... (5 episodes, 1996-1998) |
| Elyse Whittaker | .... | prop designer / assistant storyboard artist (5 episodes, 1998-1999) |
| Stark Howell | .... | storyboard director / storyboard artist (4 episodes, 1996-1998) |
| Kelly James | .... | storyboard director / storyboard artist (4 episodes, 1997-1999) |
| Claudia Stegall | .... | prop designer (4 episodes, 1997-1998) |
| Melissa Suber | .... | assistant storyboard artist (3 episodes, 1996-1997) |
| Amber Tornquist | .... | assistant storyboard artist (3 episodes, 1996-1997) |
| Dan Povenmire | .... | storyboard director (3 episodes, 1997-1999) |
| Jennifer Jarmel | .... | prop designer (3 episodes, 1998-1999) |
| Tricia Garcia | .... | storyboard artist / storyboard director (2 episodes, 1996-1997) |
| Karen Heathwood | .... | assistant storyboard artist (2 episodes, 1996-1997) |
| Aldin Baroza | .... | assistant storyboard artist (2 episodes, 1998-1999) |
| Caesar Martinez | .... | assistant storyboard artist / storyboard artist (2 episodes, 1998-1999) |
| Diane Kredensor | .... | storyboard artist (2 episodes, 1999-2004) |
| Louis Gallegos | .... | assistant storyboard artist (2 episodes, 1999) |
| Vanessa J. Martin | .... | prop designer (2 episodes, 1999) |
| Mike Pettengill | .... | assistant storyboard artist (2 episodes, 1999) |
| Jason Sallin | .... | assistant storyboard artist (2 episodes, 1999) |
| Dave Steen | .... | prop designer (2 episodes, 1999) |
|
| Debbie Baber | .... | storyboard artist (unknown episodes) |
| Paul Finn | .... | animatic (unknown episodes) |
| John Flagg | .... | storyboard artist (unknown episodes) |
| Kevin Kirwan | .... | colorist: DaVinci (unknown episodes) |
| Edgar Larrazábal | .... | assistant storyboard artist (unknown episodes) |
| Jerilyn Mettlin | .... | animatic (unknown episodes) |
| Stephen Sandoval | .... | storyboard artist (unknown episodes) |
| Catherine Simmonds | .... | color key stylist (unknown episodes) |
| Karin Stover | .... | painter (unknown episodes) |
| Erik Wiese | .... | storyboard artist (unknown episodes) |
| |
|
| Christine Kolosov | .... | background coordinator / animation director / ... (12 episodes, 1996-2002) |
| Doug Appleton | .... | background painter (11 episodes, 1996-1999) |
| Craig Bartlett | .... | original character designer / character designer (11 episodes, 1996-1999) |
| Clint Bond Jr. | .... | character designer (11 episodes, 1996-1999) |
| Al Budnick | .... | background painter (11 episodes, 1996-1999) |
| Kenji Notani | .... | background painter (11 episodes, 1996-1999) |
| Paul Finn | .... | animatic / animatic technician (10 episodes, 1996-1999) |
| Brian Mark | .... | layout supervisor / layout designer (10 episodes, 1996-1999) |
| Karin Stover | .... | color key artist / ink and paint artist / ... (10 episodes, 1996-1999) |
| Teale Wang | .... | color key supervisor / color production supervisor (10 episodes, 1996-1999) |
| Catherine Simmonds | .... | color key stylist / supervising color stylist (8 episodes, 1996-1999) |
| Hugh MacDonald | .... | layout designer (8 episodes, 1997-1999) |
| Karen Shaffer | .... | final checker (8 episodes, 1997-1999) |
| Claudia Stegall | .... | layout designer / character designer (8 episodes, 1997-1999) |
| Steve Socki | .... | animation director / sheet timer (7 episodes, 1996-1999) |
| Jay Lender | .... | storyboard artist / layout designer (7 episodes, 1996-1998) |
| Caesar Martinez | .... | layout designer (6 episodes, 1996-1998) |
| Tom Park | .... | layout designer (6 episodes, 1998-1999) |
| Steve Lowtwait | .... | layout designer (5 episodes, 1996-1999) |
| Larry Leichliter | .... | animation director / sheet timer (5 episodes, 1996-1998) |
| Dave Lyman | .... | sheet timer (5 episodes, 1997-1999) |
| Jian-Xun Luan | .... | background painter (5 episodes, 1998-1999) |
| Charles Garcia | .... | layout designer (4 episodes, 1998-1999) |
| Youngja Kim | .... | background painter (4 episodes, 1998-1999) |
| Adriana M. Galvez | .... | background painter (3 episodes, 1996-1997) |
| Nick Jennings | .... | background painter (3 episodes, 1996-1997) |
| Jonathon E. Goley | .... | overseas animation supervisor / overseas background supervisor (3 episodes, 1997-1999) |
| George S. Chialtas | .... | sheet timer / animation director (3 episodes, 1997) |
| Brian J. Arnold | .... | animatic (3 episodes, 1998-1999) |
| Dene Ann Heming | .... | supervising color stylist / color key stylist (3 episodes, 1998-1999) |
| Jennifer Jarmel | .... | character designer (3 episodes, 1998-1999) |
| Mike Pettengill | .... | layout designer (3 episodes, 1998-1999) |
| Elyse Whittaker | .... | character designer (3 episodes, 1998-1999) |
| Skinny Wen | .... | overseas animation supervisor (2 episodes, 1996) |
| Jerilyn Mettlin | .... | animatic (2 episodes, 1997) |
| Edgar Larrazábal | .... | sheet timer (2 episodes, 1998) |
| Younghee Higa | .... | sheet timer (2 episodes, 1999) |
| Ted Machold | .... | animatic (2 episodes, 1999) |
| Vanessa J. Martin | .... | character designer (2 episodes, 1999) |
| Dave Steen | .... | character designer (2 episodes, 1999) |
| Frank Weiss | .... | animation director / sheet timer (2 episodes, 1999) |
|
| Don Judge | .... | animation director (unknown episodes) |
| Jamie Mitchell | .... | sheet timer (unknown episodes) |
| Russ Mooney | .... | animation director (unknown episodes) |
| Howy Parkins | .... | animation director (unknown episodes) |
| Alan Smart | .... | animation director (unknown episodes) |
| |
|
| Christopher Hink | .... | supervising editor / picture editor (7 episodes, 1996-1999) |
| Mark Merthe | .... | assistant editor (6 episodes, 1997-1999) |
| Shawn Trask | .... | post-production assistant / additional post-production services (6 episodes, 1997-1999) |
| Barry Cohen | .... | on-line editor (5 episodes, 1997-1999) |
| Matt Corey | .... | assistant editor / post-production assistant (5 episodes, 1997-1999) |
| Kip Gibson | .... | on-line editor (5 episodes, 1997-1999) |
| Heather Adams | .... | post-production director (5 episodes, 1998-1999) |
| Dan Aguilar | .... | on-line editor (5 episodes, 1998-1999) |
| Dexter P. | .... | colorist: DaVinci (5 episodes, 1998-1999) |
| Meg Hanna | .... | color scanner (4 episodes, 1998-1999) |
| Suzanne Benton | .... | post-production coordinator (3 episodes, 1996-1997) |
| Kevin Kirwan | .... | colorist: DaVinci (3 episodes, 1997) |
| Jessica Dorff | .... | post-production coordinator (3 episodes, 1998-1999) |
| Scott Jeffress | .... | supervising editor (2 episodes, 1996) |
| Matt Brown | .... | additional post-production services (2 episodes, 1999) |
| Mishelle Fordham | .... | additional post-production services (2 episodes, 1999) |
| Michael Petak | .... | additional post-production services (2 episodes, 1999) |
|
| Faust Pierfederici | .... | on-line editor (unknown episodes) |
| |
|
| Danica Ivancevic | .... | writing assistant (10 episodes, 1996-1999) |
| Jonathon E. Goley | .... | overseas supervisor / overseas background supervisor (7 episodes, 1996-1999) |
| Michelle Lamoreaux | .... | executive assistant / story editor (7 episodes, 1997-1999) |
| Kelly Crews | .... | production coordinator / senior production coordinator (6 episodes, 1997-1999) |
| Ryan Slater | .... | production coordinator / production assistant (6 episodes, 1997-1999) |
| Robert Cseko | .... | financial services / financial services: Nickelodeon (5 episodes, 1996-1997) |
| Bill Hutten | .... | financial services / financial services: Nickelodeon (5 episodes, 1996-1997) |
| Jim Lara | .... | production assistant / production coordinator (5 episodes, 1996-1997) |
| Lora Lee | .... | production executive / story editor: Nickelodeon / ... (5 episodes, 1997-2003) |
| Steve Socki | .... | supervising director (5 episodes, 1997-1999) |
| Christie Insley | .... | executive assistant (5 episodes, 1998-1999) |
| Kenneth Mu | .... | intern / production assistant (5 episodes, 1998-1999) |
| June Tedesco | .... | production assistant / intern (4 episodes, 1996-1999) |
| Jonathan Greenberg | .... | story editor (4 episodes, 1997-1999) |
| Larry Leichliter | .... | supervising director (4 episodes, 1997-1998) |
| Vince Calandra | .... | story editor: Nickelodeon (3 episodes, 1996-1997) |
| Lisa Fuson | .... | assistant to producers / executive assistant (3 episodes, 1996-1997) |
| Dina Buteyn | .... | executive assistant (3 episodes, 1998-1999) |
| Heath Cecere | .... | intern (3 episodes, 1998-1999) |
| Ani Martirossians | .... | production assistant (3 episodes, 1998-1999) |
| Joseph Purdy | .... | story editor (2 episodes, 1996-1997) |
| Antoinette Stella | .... | story editor (2 episodes, 1997-1998) |
| Vito Curcuru | .... | production assistant (2 episodes, 1997) |
| Stephanie Henning | .... | intern (2 episodes, 1997) |
| Kristina Klockars | .... | executive assistant (2 episodes, 1997) |
| Dave Warden | .... | production assistant (2 episodes, 1997) |
| Nancy Goree | .... | intern (2 episodes, 1998-1999) |
| Stephen King | .... | intern (2 episodes, 1998-1999) |
| Christopher Thorp | .... | intern (2 episodes, 1998-1999) |
| Mark Valenti | .... | story editor: Nickelodeon (2 episodes, 1998-1999) |
| Holly Almaguer | .... | intern (2 episodes, 1999) |
| Teri Dengate | .... | intern (2 episodes, 1999) |
| Kristie Fujuyama | .... | intern (2 episodes, 1999) |
| Adrian Hammers | .... | intern (2 episodes, 1999) |
| Steve Keller | .... | production executive (2 episodes, 1999) |
| Doris Lee | .... | intern (2 episodes, 1999) |
| Cecile Michaelis | .... | production assistant (2 episodes, 1999) |
| Joanne Tsai | .... | intern (2 episodes, 1999) |
| Tuck Tucker | .... | supervising director (2 episodes, 1999) |
|
| Heather Morgan | .... | publicist (unknown episodes, 2003) |
| Joe Ansolabehere | .... | developer (unknown episodes) |
| Craig Bartlett | .... | developer / original characters / ... (unknown episodes) |
| Romney T. Marino | .... | production intern (unknown episodes) |
| Steve Viksten | .... | developer (unknown episodes) |
| |