- Echo Kellum - Guitar (voice)
- Maile Flanagan - Clerk / Jr Elephant / Jr Barton (voice)
- 'Weird Al' Yankovic - Mr. Ding-a-Ling (voice)
- James Urbaniak - Nose Picker Fish (voice)
- Danny Trejo - Filthy the Foot (voice)
- David Cronenberg - Dr. Cronenbird (voice)
- David Cross - Thaddeus D. Actwell (voice)
- Yuri Lowenthal - Prince Mermeow / Jr Sneezy (voice)
- Yuri Lowenthal - Prince Mermeow (voice)
- Patton Oswalt - Jimmy Ron Cricket (voice)
- Justin Roiland - Psychopath Giraffe (voice)
- Justin Roiland - Radical Rick (voice)
- Justin Roiland - Psychopath Giraffe / Radical Rick (voice)
- Kurtwood Smith - Angry Old Raisin (voice)
- Mindy Sterling - Brainy Jane (voice)
- Dylan Saunders - Tooth / Fortune Cookie (voice)
- Dyana Liu - Tiny Goosey (voice)
- Dyana Liu - Lady Primavera (voice)
- Gary Anthony Williams - Coach McGinty (voice)
- Gary Anthony Williams - Robert R. Cade (voice)
- Gary Anthony Williams - DJ Wheelbarrow Full of Nachos (voice)
- Tom Kenny - Earthworm / Steve (voice)
- Bill Fagerbakke - Banana's Dad (voice)
- Eric Edelstein - Timmy (voice)
- Debra Wilson - Nasty Cat / Mrs. Manelli (voice)
- Fred Tatasciore - Thomas Jefferson (voice)
- Danny Jacobs - Cuddles Jr. / Lasagna (voice)
- Danny Jacobs - Barbershop Quartet (voice)
- Rob Paulsen - Professor Huh? / Octopus King of the Nerds (voice)
- Ashly Burch - Lila Twinklepipes (voice)
- Robert Englund - Lost Larry (voice)
- Kari Wahlgren - Eve Gruntfest (voice)
- Johnny Ryan
- Louis J. Cuck
- David Sacks
- Dave Cooper
Kurtwood Smith interpreta a Angry Old Raisin (voice) en la serie.
David Cross interpreta a Thaddeus D. Actwell (voice) en la serie.
James Adomian hace el papel de President of the Planet (voice).
Thomas F. Wilson interpreta a Banana (voice) en la serie.
Candi Milo interpreta a Goat (voice) en la serie.
Jeff Bennett interpreta a Clerk McGirk / Ranger Rhino / Rasta Rat / Sleazy Beave (voice) en la serie.
Paul Rugg interpreta a Cricket (voice) en la serie.
John DiMaggio interpreta a Burgerstein / Shragger / Armpit Willy (voice) en la serie.
Matt Jones interpreta a Pig (voice) en la serie.
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