- Conrad Vernon - Mason (voice)
- Wayne Knight - Max (voice)
- Wayne Knight - Max
- Tara Strong - Teacher / Kid Walla (voice)
- Clancy Brown - Buck Rockgut (voice)
- Richard Kind - Roger (voice)
- Kathy Kinney - Rhonda (voice)
- Fred Stoller - Fred (voice)
- Cedric Yarbrough - Officer X (voice)
- Jane Leeves - Lulu (voice)
- Rob Paulsen - Archie (voice)
- Kevin McDonald - Barry (voice)
- Neil Patrick Harris - Dr. Blowhole (voice)
- Gary Cole - Commissioner (voice)
- Will Friedle - Randy (voice)
- Debbie Reynolds - Granny Squirrel (voice)
- Jerry Trainor - Lead Roach (voice)
- Brian Posehn - Roach (voice)
- Nathan Kress - Ronald (voice)
- Victoria Justice - Stacy (voice)
- Jennette McCurdy - Becky (voice)
- Dana Snyder - Leonard (voice)
- Nestor Carbonell - Savio (voice)
- French Stewart - Cecil (voice)
- Carl Reiner - Santa Claus (voice)
- Leigh-Allyn Baker - Bella Bon Bueno (voice)
- JoAnna Garcia - Shawna (voice)
- Larry Miller - Clemson (voice)
- Atticus Shaffer - The Vesuvius Twins (voice)
- Kristen Schaal - The Bunnies (voice)
- Peter Capaldi - Uncle Nigel (voice)
- Megan Hilty - Frances Alberta (voice)
- Wally Wingert - Alex (voice)
- Lewis Black - Dale (voice)
- Ciara Bravo - Hunter (voice)
- Ed O'Neill - Hunter's Father (voice)
- Brian Stepanek - Dode (voice)
- Ashley Bell - Zoe (voice)
- Rolonda Watts - Gladys (voice)
- Melissa McCarthy - Shelly (voice)
- Julie White - Ma (voice)
- Dot-Marie Jones - Supervisor Eubanks (voice)
- Jim Cummings - Gomer / Bo (voice)
- Patrick Warburton - Elmer (voice)
- Audrey Wasilewski - Mental Hen (voice)
- Jessica DiCicco - Ramona / Bradley / Samuel (voice)
- Dee Bradley Baker - Pete Peters (voice)
- Conan O'Brien - Kuchikukan (voice)
- Clyde Kusatsu - Shingen (voice)
- Kendall Schmidt - Kendall (voice)
- Logan Henderson - Logan (voice)
- James Maslow - James (voice)
- Carlos PenaVega - Carlos (voice)
- Ty Burrell - Parker (voice)
- Calista Flockhart - Doris (voice)
- Bret Haaland
Carl Reiner hace el papel de Santa Claus (voice).
Wayne Knight interpreta a Max (voice) en la serie.
Larry Miller hace el papel de Clemson (voice).
Clyde Kusatsu interpreta a Shingen (voice) en la serie.
Tom McGrath hace el papel de Skipper (voice).
Jeff Bennett interpreta a Kowalski (voice) en la serie.
James Patrick Stuart interpreta a Private (voice) en la serie.
John DiMaggio interpreta a Rico (voice) en la serie.
Danny Jacobs interpreta a King Julien XIII (voice) en la serie.
Kevin Michael Richardson hace el papel de Maurice (voice).
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