- Keith Ferguson - Dr. Grant (voice)
- Abby Trott - Dr. Sattler (voice)
- Andrew Kishino - Yakuza Son (voice)
- Lauren Lapkus - Cupcake (voice)
- Lauren Lapkus - Gabriella (voice)
- Melissa Rauch - Marie (voice)
- Jeff Bennett - Louis (voice)
- Andy Milder - Teamster #2 (voice)
- Andy Milder - Knight #1 (voice)
- Andy Milder - Steven Spielberg (voice)
- Phil LaMarr - Reporter (voice)
- Phil LaMarr - No-Name (voice)
- Armando Valdes-Kennedy - Wakko in Spanish (voice)
- Romi Dames - Yakuza Mom (voice)
- Romi Dames - Clerk (voice)
- Romi Dames - Tour Guide (voice)
- Brendan Hunt - Seth Meyers (voice)
- Piotr Michael - Castle Guard #2 (voice)
- Piotr Michael - Shipmate #1 (voice)
- Diedrich Bader - Odysseus (voice)
- Dee Bradley Baker - Theatrical Minstrel (voice)
- Bob Bergen - Porky Pig (voice)
- Jeff Bergman - Sylvester (voice)
- Evan Ferrante - Host #1 (voice)
- Carl Faruolo - Backwards Gary (voice)
- Carl Faruolo - Mona Lisa Sandwich (voice)
- Peter Stormare - Nickelwise (voice)
- Kevin Michael Richardson - Zit (voice)
- Kevin Michael Richardson - Glowing Eyes (voice)
- Kevin Michael Richardson - Sokolov / Wakov (voice)
- Kimberly Brooks - Sojourner (voice)
- Kimberly Brooks - Daycare Worker 1 / Riley / Toddler 1 (voice)
- Kimberly Brooks - Kid #2 (voice)
- Kimberly Brooks - Audience Member (voice)
- Kimberly Brooks - Elaine (voice)
- Kimberly Brooks - Defensive Fan #3
- Ely Henry - Nerdy Troll (voice)
- Rachael MacFarlane - Boss (voice)
- Rachael MacFarlane - Nancy / Urchin (voice)
- Rachael MacFarlane - Announcer / Dandelion (voice)
- Rachael MacFarlane - Jean Gravy (voice)
- Rachael MacFarlane - Elizabeth / Dot's Assistant (voice)
- Rachael MacFarlane - Alien (voice)
- Rachael MacFarlane - Gillian / Left Mother (voice)
- Rachael MacFarlane - Daycare Worker 2 / Mother / Toddler 2 (voice)
- Rachael MacFarlane - Lady in Bank (voice)
- Zeno Robinson - Jay-Pac / Defensive Fan #1
- Zeno Robinson - Gordon (voice)
- Niki Yang - Defensive Fan #2
- Niki Yang - Soo Yun the Ghost (voice)
- T.J. Ramini - Guard / Vendor (voice)
- Jameela Jamil - Sultana (voice)
- John Viener - Left Couple Person / John (voice)
- John Viener - Booming Voice / Random Thief (voice)
- Wellesley Wild - Manny / Right Side Man (voice)
- Carlos Alazraqui - Tuck Buckerson (voice)
- Carlos Alazraqui - Mexican Commentator / Venezuelan Host (voice)
- Carlos Alazraqui - Lotto Announcer (voice)
- Carlos Alazraqui - Leader Alien (voice)
- Carlos Alazraqui - Conductor / Moose (voice)
- Carlos Alazraqui - Ed / Grandson (voice)
- Carlos Alazraqui - Announcer (voice)
- Carlos Alazraqui - John (voice)
- Carlos Alazraqui - Joe (voice)
- Carlos Alazraqui - Nicolás Maduro / Rodrigo (voice)
- Danny Jacobs - Starbox (voice)
- Danny Jacobs - Baldo / Driver / Villager (voice)
- Danny Jacobs - Crier (voice)
- Danny Jacobs - Grubb (voice)
- Danny Jacobs - Dwayne LaPistol (voice)
- Danny Jacobs - Russian Tech (voice)
- Danny Jacobs - Chief Thief (voice)
- Danny Jacobs - Dust-Boy / Scientist / Security Guard (voice)
- Danny Jacobs - Hysterical Conductor (voice)
- Danny Jacobs - Lawyer (voice)
- Danny Jacobs - Van Gogh (voice)
- Danny Jacobs - Male Reporter 1 / Princeton Russell (voice)
- Corey Burton - Exercise Announcer (voice)
- Corey Burton - Senator Smith (voice)
- Corey Burton - Announcer (voice)
- Corey Burton - Radio DJ (voice)
- Corey Burton - TV Announcer (voice)
- Sean Kenin - Irv Gold (voice)
- Randy Rogel - Randy (voice)
- Jake Green - BoysStorm Boys / Teenager #3 (voice)
- Jake Green - Correction Fluid (voice)
- Jake Green - Noah (voice)
- Jake Green - Fred Bagel / P.A. (voice)
- Jake Green - Glowing Eyes (voice)
- Jake Green - Dorko / Dweebo (voice)
- Jake Green - Pageant Registrar (voice)
- Jake Green - Bieber Monster / Shipmate (voice)
- Jake Green - Male Guard / Snowden (voice)
- Jake Green - Bradimir / Contestant / Military Police 2 (voice)
- Jake Green - Meatball Man (voice)
- Salli Saffioti - Raquel Madcow (voice)
- Salli Saffioti - Kid #3 / Kindergartner (voice)
- Salli Saffioti - Sweaty Jogger (voice)
- Eric Bauza - Kim Jong-un (voice)
- Eric Bauza - Daffy Duck (voice)
- Eric Bauza - Daffy Duck / Pepe Le Pew (voice)
- Eric Bauza - Daffy Duck / Warhol (voice)
- Eric Bauza - Shaun / Officiant (voice)
- Chris Cox - Egwind (voice)
- Chris Cox - Binder / Truck Driver (voice)
- Chris Cox - Castle Guard #1 / Egwind / Knight #2
- Chris Cox - Coffee Bar Patron / Egwind (voice)
- Kari Wahlgren - May the Mayfly (voice)
- Kari Wahlgren - Stapler / Teenage Butterfly (voice)
- Kari Wahlgren - Teenager #2 (voice)
- Kari Wahlgren - Audience Member / Narrator / Kid #1 (voice)
- Kari Wahlgren - Marla (voice)
- Kari Wahlgren - Symphony B (voice)
- Kari Wahlgren - Kid / Woman (voice)
- Kari Wahlgren - Phonenicia (voice)
- Kari Wahlgren - Teen Employee (voice)
- Kari Wahlgren - Athena / Tourist (voice)
- Kari Wahlgren - Brilly Brumley / Sheila Lickspittle (voice)
- Kari Wahlgren - Marsha (voice)
- Kari Wahlgren - Kelly Sue / Mom (voice)
- Kari Wahlgren - Glowing Eyes (voice)
- Ralph Garman - Conductor / Cymbalist (voice)
- Ralph Garman - Shipmate (voice)
- Ralph Garman - Uptight Announcer (voice)
- Charlet Chung - Young Woman (voice)
- Jorge R. Gutierrez - Diego Rivera (voice)
- Jon Bailey - Alien 1 / Alien 2 (voice)
- Jon Bailey - Audience Member #2 / Male Narrator / Short Man (voice)
- Jon Bailey - Pegasus (voice)
- Grey DeLisle - Brie (voice)
- Grey DeLisle - Bandicoot / Koala (voice)
- Lesley Nicol - Drusilla / Baker's Wife (voice)
- Lesley Nicol - Mrs. Kettle (voice)
- Yong Kim - Boss / Young Man (voice)
- Fred Tatasciore - Announcer / Beastwipe (voice)
- Fred Tatasciore - Nils (voice)
- Fred Tatasciore - Benedict (voice)
- Fred Tatasciore - Lobbyist (voice)
- Fred Tatasciore - Ivan the Terrible / The Rat-sputin / Yakov (voice)
- Fred Tatasciore - Demon Judge / Nils / Old Man (voice)
- Fred Tatasciore - Nero / Nils (voice)
- Fred Tatasciore - Contestant #1 / Contestant #2 / Mr. Relatable (voice)
- Fred Tatasciore - Founding Father (voice)
- Karan Brar - Teenager Kyle (voice)
- Karan Brar - Male Student (voice)
- Anthony Carrigan - Putin (voice)
- Frank Welker - Ralph (voice)
- Frank Welker - Jackass Monkey / Ralph (voice)
- Frank Welker - 23 & WB Employee / Ralph (voice)
- Frank Welker - Ralphicus (voice)
- Frank Welker - King (voice)
- Frank Welker - Constable Ralphers / Judge Plotz (voice)
- Frank Welker - Ralph / Clunko (voice)
- Frank Welker - Ralph / Vampire (voice)
- Frank Welker - Male Gallery Member / Ralphus (voice)
- Frank Welker - Teamster #1 (voice)
- Frank Welker - Baby Boo (voice)
- Frank Welker - Ralph / Waiter (voice)
- Frank Welker - Cat (voice)
- Frank Welker - Ralph Yakko (voice)
- Frank Welker - Chicken Boo (voice)
- Frank Welker - Horse (voice)
- Frank Welker - Priest (voice)
- Tim Gunn - Pageant Host (voice)
- Stephanie Escajeda - Nora Rita Norita (voice)
- Stephanie Escajeda - Nora Rita Norita / Email #3 (voice)
- Stephanie Escajeda - Woman (voice)
- Stephanie Escajeda - Nora Brownlow (voice)
- Ken Marino - Columbus (voice)
- Maria Bamford - Julia (voice)
- Maria Bamford - Tammy (voice)
- Nancy Cartwright - Hostess / Symphony A (voice)
- Nancy Cartwright - Animator (voice)
- Chris Geere - Disgruntled Employee (voice)
- Chris Geere - King John (voice)
- Chris Geere - Barnaby (voice)
- Chris Geere - Dr. Doppler (voice)
- Will Lyman - Narrator (voice)
- Chrissie Fit - Cora (voice)
- Chrissie Fit - Female Student (voice)
- Chrissie Fit - Catfish Joan / Female Fan (voice)
- John DiMaggio - Gnome (voice)
- John DiMaggio - Santa (voice)
- John DiMaggio - Benjamin Franklin (voice)
- Alanna Ubach - Maura (voice)
- Alanna Ubach - Binx (voice)
- Candi Milo - Flora (voice)
- Candi Milo - Flora / Theodora (voice)
- Sherri Stoner - Slappy Squirrel (voice)
- Chris Diamantopoulos - Dexter / Festival Goer #1 (voice)
- Chris Diamantopoulos - Josh Polar (voice)
- Natalie Lander - Gigi Soda (voice)
- Charlotte Nicdao - Abigail (voice)
- Paul Rugg - Clown (voice) (uncredited)
- Neil Ross - Narrator (voice)
- Natalie Palamides - DJ / Stilt Walker (voice)
- Melissa Fumero - Maria / Luisa (voice)
- Larissa Gallagher - Kangaroo / Platypus (voice)
- Tom Ruegger
- Rich Arons
- Peter Hastings
- Rusty Mills
- Steven Spielberg
- Sherri Stoner
Peter Stormare interpreta a Nickelwise (voice) en la serie.
Nancy Cartwright hace el papel de Hostess / Symphony A (voice).
Rob Paulsen interpreta a Yakko Warner / Pinky (voice) en la serie.
Jess Harnell hace el papel de Wakko Warner (voice).
Tress MacNeille hace el papel de Dot Warner (voice).
Maurice LaMarche interpreta a Brain (voice) en la serie.
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