- Olivia Hack - Rhonda Wellington Lloyd (voice)
- Olivia Hack - Rhonda Wellington Lloyd / Mary (voice)
- Phillip Van Dyke - Arnold (voice)
- Phillip Van Dyke - Ludwig (voice)
- Christopher Walberg - Stinky Peterson (voice)
- Christopher Walberg - Stinky Peterson / Kyle (voice)
- Christopher Walberg - Stinky Peterson / Bratty Kid #1 (voice)
- Christopher Walberg - Stinky Peterson (voice; uncredited)
- Justin Shenkarow - Harold Berman (voice)
- Justin Shenkarow - Harold Berman(voice)
- Justin Shenkarow - Harold Berman / Robert (voice)
- Justin Shenkarow - Joey (voice)
- Justin Shenkarow - Harold Berman / Boy on Bicycle (voice)
- Justin Shenkarow - Harold Berman (voice; uncredited)
- Justin Shenkarow - Harold Berman / Iggy (voice)
- Lane Toran - Arnold (voice)
- Lane Toran - Wolfgang (voice)
- Lane Toran - Wolfgang / French Boy (voice)
- Lane Toran - Arnold (singing voice)
- Dan Castellaneta - Grandpa Phil (voice)
- Dan Castellaneta - Grandpa Phil / Nick Vermicelli (voice)
- Dan Castellaneta - Big Arnold (voice)
- Dan Castellaneta - Animal Control Officer (voice)
- Dan Castellaneta - Grandpa Phil / Nolo (voice)
- Dan Castellaneta - Delivery Man (voice)
- Dan Castellaneta - Grandpa Phil / Chicken Man (voice)
- Dan Castellaneta - Grandpa Phil / Judge (voice)
- Dan Castellaneta - Grandpa Phil / Reporter (voice)
- Dan Castellaneta - Grandpa Phil / Cop #1 (voice)
- Dan Castellaneta - Nick Vermicelli (voice)
- Dan Castellaneta - Grandpa Phil / Grandpa Phil's Father / Jolly Olly Man (voice)
- Anndi McAfee - Phoebe Heyerdahl (voice)
- Anndi McAfee - Patrice (voice)
- Anndi McAfee - Phoebe Heyerdahl / Kid #2
- Anndi McAfee - Phoebe Heyerdahl / Italian Girl / French Girl (voice)
- Anndi McAfee - Phoebe Heyerdahl / Joy (voice)
- Anndi McAfee - Phoebe Heyerdahl / Ruth P. McDougal (voice)
- Anndi McAfee - Phoebe Heyerdahl / Worker #2 (voice)
- Anndi McAfee - Phoebe Heyerdahl / Girl (voice)
- Anndi McAfee - Phoebe Heyerdahl / Woman (voice)
- Anndi McAfee - Phoebe Heyerdahl / Clerk (voice)
- Mayim Bialik - Maria (voice)
- Elizabeth Ashley - Mrs. Vitello (voice)
- Brian Doyle-Murray - Lasombra
- Davy Jones - Himself
- Steven Hartman - Curly (voice)
- Christopher Castile - Eugene Horowitz (voice)
- Christopher Castile - Eugene Horowitz / Robert (voice)
- John Mariano - Vic / Morrie (voice)
- John Mariano - Zamboni Jones / Banana Guy / Shady Guy (voice)
- Danny Cooksey - Stoop Kid (voice)
- Shari Belafonte - Mrs. Johanssen (voice)
- Lauren Robinson - Nadine (voice)
- Pamela Hayden - Connie (voice)
- Michael Donovan - Maria's Dad / Cabby (voice)
- Ben Diskin - Eugene Horowitz (voice)
- Ben Diskin - Eugene Horowitz / Kid (voice)
- Quinton Flynn - Man #1 (voice)
- Christine Ebersole - Lana Vail (voice)
- Sam Gifaldi - Sid (voice)
- Sam Gifaldi - Billy (voice)
- Sam Gifaldi - Sid / Robert (voice)
- James Keane - Mr. Green (voice)
- James Keane - Mr. Green (voice; uncredited)
- James Keane - Hospital Orderly (voice)
- James Keane - Mr. Green / Judge (voice)
- James Keane - Mr. Green / EBN Announcer (voice)
- Jim Lang - The Mad Engineer (voice)
- Danny Strong - Teen #1 / Teen #2 (voice)
- Adam Wylie - Curly Gammelthorpe (voice)
- Hiep Thi Le - Mai Hyunh (voice)
- Jim Belushi - Coach Wittenberg (voice)
- Grant Gelt - Tucker Wittenberg (voice)
- Marcus Toji - Park (voice)
- Marcus Toji - Park / Third Grader (voice)
- Marcus Toji - Park / Iggy (voice)
- Lou Rawls - Harvey (voice)
- Lou Rawls - Harvey (voice; uncredited)
- Lou Rawls - Harvey / Bus Driver (voice)
- Lou Rawls - Harvey / Pop Daddy (voice)
- Max Casella - Tony B. / Philly D. (voice)
- Michael Bacall - Torvald (voice)
- Michael Bacall - Tony (voice)
- Michael Bacall - Tommy (voice)
- Tress MacNeille - Grandma Gertie (voice)
- Tress MacNeille - Miss Slovak (voice)
- Tress MacNeille - Movie Woman (voice)
- Tress MacNeille - Grandma Gertie / Mayor Dixie (voice)
- Tress MacNeille - Grandma Gertie / Harold's Aunt (voice)
- Tress MacNeille - Grandma Gertie / Interviewer #2 (voice)
- Tress MacNeille - Grandma Gertie / Miss Slovak (voice)
- Tress MacNeille - Grandma Gertie / Arnold's Mother (voice)
- Tress MacNeille - Grandma Gertie / Iggy / Joey (voice)
- Kevin Michael Richardson - Blind Man / Newscaster (voice)
- Mark Hamill - Cop (voice)
- Mark Hamill - Grubby (voice)
- Vincent Schiavelli - Pigeon Man (voice)
- Vincent Schiavelli - Mr. Bailey (voice)
- Caroline Aaron - Moderator (voice)
- Caroline Aaron - Landlady (voice)
- DeeDee Rescher - Torvald's Mother (voice)
- Rick Fitts - Mr. Johanssen (voice)
- Carlos Alazraqui - Frankie G. / Chas (voice)
- Carlos Alazraqui - Minion (voice)
- Carlos Alazraqui - Nigel / Man (voice)
- Ben Aaron - Jamie O Johanssen (voice)
- Avriel Epps - Timberly Johanssen (voice)
- Mary Scheer - Suzie Kokoshka (voice)
- Mary Scheer - Suzie Kokoshka / Interviewer #1 (voice)
- Joe Purdy - Mr. Purdy (voice; uncredited)
- Angie Jaree - Big Bob Jingle Singer (voice)
- Michael Fishman - Joey Stevenson (voice)
- Joey Paul Jensen - Seymour's Mother (voice)
- Joey Paul Jensen - Woman on Street (voice)
- Joey Paul Jensen - Mindy / Mrs. Uberman (voice)
- Joey Paul Jensen - Woman (voice)
- David L. Lander - Sam the Sewer King (voice)
- Jarrett Lennon - Eugene Horowitz (voice)
- Billy Riback - TV Reporter / Announcer (voice)
- Billy Riback - Announcer / PSA Guy (voice)
- Baoan Coleman - Mr. Hyunh (voice)
- Baoan Coleman - Oskar Kokoshka (voice)
- Dom Irrera - Ernie Potts (voice)
- Dom Irrera - Guard / Mr. Feltz (voice)
- Dom Irrera - Stinky's Father (voice)
- Dom Irrera - Ernie Potts / Paper Man (voice)
- Dom Irrera - Ernie Potts / Old Man (voice)
- Lacey Chabert - Ruth P. McDougal (voice)
- Lloyd Sherr - Berlitz Teacher / Stylist (voice)
- Kath Soucie - Miriam Pataki (voice)
- Kath Soucie - Mrs. Berman (voice)
- Kath Soucie - Mrs. Berman / Mrs. Ryle (voice)
- Kath Soucie - Mariam Pataki (voice)
- Kath Soucie - Hillary / Martha (voice)
- Kath Soucie - Lunch Lady (voice)
- Kath Soucie - Miriam Pataki / Nancy Woman (voice)
- Kath Soucie - Miriam Pataki / Yolanda (voice)
- Kath Soucie - Cecile (voice)
- Kath Soucie - Mrs. Vitello (voice)
- Kath Soucie - Mrs. Berman / Miriam Pataki (voice)
- Kath Soucie - Miriam Pataki / Woman (voice)
- Kath Soucie - Mrs. Berman / Danny (voice)
- Kath Soucie - Agent (voice)
- Lisa Fuson - Movie Woman (voice)
- Lisa Fuson - Danny's Mom / Bratty Kid #2 (voice)
- Lisa Fuson - Miss Slovak (voice)
- Craig Bartlett - Brainy (voice)
- Craig Bartlett - Brainy (voice; uncredited)
- Craig Bartlett - DJ (voice)
- Craig Bartlett - Brainy / DJ (voice)
- Craig Bartlett - Brainy / Steel Mill Worker (voice)
- Craig Bartlett - Nashville Ned / Customer #1 (voice)
- Craig Bartlett - Minister (voice)
- Craig Bartlett - Big Man (voice)
- Craig Bartlett - Arnold's Father (voice)
- Craig Bartlett - Father (voice)
- Craig Bartlett - Abner (voice)
- Craig Bartlett - Monkeyman (voice; uncredited)
- Craig Bartlett - Mop Guy (voice)
- Craig Bartlett - Chester (voice)
- Craig Bartlett - Brainy / Paper Boy (voice)
- Craig Bartlett - Cabbie / Party Clown (voice)
- Craig Bartlett - Brainy / Mr. Packenham (voice)
- Craig Bartlett - Movie Man / Steve (voice)
- Craig Bartlett - Brainy / Astronaut / Stockbroker (voice)
- Julia Louis-Dreyfus - Miss Felter (voice)
- Ron Perlman - Mickey Kaline (voice)
- Ron Perlman - Mickey Kaline / Weiner Cooker (voice)
- Elliott Gould - Rabbi Goldberg (voice)
- Cathy Moriarty - Tish Wittenberg (voice)
- Joey Stinson - Rex Smythe-Higgins III (voice)
- Daniel Stern - Mr. Packenham (voice)
- Harvey Korman - Don Reynolds (voice)
- Alan Paul - Dino Spumoni (singing voice)
- David Wohl - Principal Wartz (voice)
- David Wohl - Mr. Berman (voice)
- David Wohl - Mr. Berman / Bus Driver (voice)
- David Wohl - Principal Wartz / Bad Guy (voice)
- David Wohl - Principal Wartz / Announcer (voice)
- John Garry - Lieutenant Major Goose (voice)
- Kathy Najimy - Madame Blanche (voice)
- Marty York - Mickey the Weasel / Fifth Grader #1 (voice)
- Steve Viksten - Oskar Kokoshka (voice)
- Steve Viksten - Oskar Kokoshka / Stagehand (voice)
- Steve Viksten - Oskar Kokoshka / Burt (voice)
- Steve Viksten - Oskar Kokoshka / Caesar (voice)
- Steve Viksten - Oskar Kokoshka / Cop #2 (voice)
- Steve Viksten - Italian Boy (voice)
- Steve Viksten - Oskar Kokoshka / Casa Paradiso Spokesman (voice)
- Steve Viksten - Caesar (voice; uncredited)
- Steve Viksten - Oskar Kokoshka / Caesar (voice; uncredited)
- Steve Viksten - Oskar Kokoshka / Smitty (voice)
- Maurice LaMarche - Big Bob Pataki (voice)
- Maurice LaMarche - Revis (voice)
- Maurice LaMarche - Big Bob Pataki / Uncle Chuck (voice)
- Maurice LaMarche - Big Bob Pataki / TV Man (voice)
- Maurice LaMarche - Stinky's Father / Stinky's Grandpa (voice)
- Maurice LaMarche - Abner (voice)
- Maurice LaMarche - Big Bob Pataki / Clerk (voice)
- Maurice LaMarche - Big Bob Pataki / Douglas Cain (voice)
- Maurice LaMarche - Maurice / Director (voice)
- Maurice LaMarche - Big Bob Pataki / Moderator (voice)
- Maurice LaMarche - Cecile's Dad / Jacques (voice)
- Maurice LaMarche - Big Bob Pataki / Mechanic (voice)
- Maurice LaMarche - Big Bob Pataki / Organ Grinder (voice)
- Tony Jay - Rex Smythe-Higgins (voice)
- Tony Jay - Booming Voice (voice)
- Tony Jay - Dr. Lipman (voice)
- Nika Futterman - Olga Pataki (voice)
- Nika Futterman - Lorenzo's Mother (voice)
- Nika Futterman - Cynthia (voice)
- John Schuck - Wally / Announcer (voice)
- Ashley Buccille - Lila Sawyer (voice)
- Danielle Judovits - Patricia "Big Patty" Smith (voice)
- Clancy Brown - Dan (voice)
- John Rubano - Sherm (voice)
- George Takei - Phoebe's Father (voice)
- Jean Smart - Phoebe's Mother (voice)
- Carol Kane - Emily Dickinson Trophy (voice)
- Jamie Farr - Mr. Wacko (voice)
- Jordan Warkol - Chocolate Boy (voice)
- Jordan Warkol - Chocolate Boy / Jamie (voice)
- Dan Butler - Mr. Simmons (voice)
- Dan Butler - Mr. Simmons (voice; uncredited)
- Dan Butler - Mr. Simmons / Lila's Father (voice)
- Dan Butler - Mr. Simmons / Scientist (voice)
- Dan Butler - Mr. Simmons / Houseboy (voice)
- Dan Butler - Mr. Simmons / Dispatcher (voice)
- Dan Butler - Mr. Simmons / Publisher (voice)
- Sam McMurray - Robbie Fisher (voice)
- Ashley Tesoro - Fifth Grader (voice)
- Jer Adrianne Lelliott - Little Kid (voice)
- Randy Travis - Travis Randall / Mr. Hyunh's Singing (voice)
- Hari Oziol - Boy in Crowd (voice)
- Mary Gross - Shelley (voice)
- Mary Gross - Nurse / Actress (voice)
- Lori Alan - Secretary / Cop / Candy Lady (voice)
- Lori Alan - Rhonda's Mother (voice)
- Victor Samuel Lopez - Lorenzo (voice)
- Wendy Hammers - Jackie Lee (voice)
- Bronson Pinchot - Director / Chauffeur (voice)
- Bronson Pinchot - Ronnie Matthews (voice)
- Peter Scolari - Doug LeSham (voice)
- Christian Mena - Ronnie Matthews (singing voice)
- Gregg Berger - Policeman / Jolly Olly Boss (voice)
- Gregg Berger - Lucky / Worker #1 (voice)
- Joseph Ashton - Iggy (voice)
- Jane Carr - Inga (voice)
- Moira Quirk - Woman / Kid #3 (voice)
- Mitzi McCall - Pearl Simmons (voice)
- Maria Bamford - Iggy's Mother (voice)
- Maria Bamford - Mayor Dixie (voice)
- Maria Bamford - Mayor Dixie / Stinky's Grandma (voice)
- Rose Marie - Agatha Caulfield (voice)
- Tim Curry - Mr. Leichliter (voice)
- Kyle Gibson - Crony (voice)
- Cameron Van Hoy - Big Gino (voice)
- Phil LaMarr - Jamie O Johanssen (voice)
- Candi Milo - Cherice (voice)
- Candi Milo - The Parrot (voice)
- Laraine Newman - Librarian / Kid (voice)
- Phyllis Diller - Mitzi
- Gábor Csupó
- Craig Bartlett
- Francesca Marie Smith
- Jim Lang
Mark Hamill hace el papel de Cop (voice).
Francesca Marie Smith interpreta a Helga Pataki (voice) en la serie.
Elliott Gould interpreta a Rabbi Goldberg (voice) en la serie.
Ron Perlman interpreta a Mickey Kaline / Weiner Cooker (voice) en la serie.
Bronson Pinchot interpreta a Ronnie Matthews (voice) en la serie.
Vincent Schiavelli interpreta a Pigeon Man (voice) en la serie.
Caroline Aaron interpreta a Moderator (voice) en la serie.
Danny Cooksey hace el papel de Stoop Kid (voice).
Christine Ebersole interpreta a Lana Vail (voice) en la serie.
James Keane interpreta a Mr. Green / Judge (voice) en la serie.
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