- James Adomian - Buck Leatherleaf (voice)
- Fred Tatasciore - Soggy Joe (voice)
- Kristen Johnston - Braddock (voice)
- Paul Eiding - Monroe (voice)
- Kevin McDonald - Albus Duckweed (voice)
- Scott Menville - Quentin (voice)
- Kevin Michael Richardson - Mr. Flour (voice)
- Chris Sullivan - Gunther (voice)
- Chris Sullivan - Teddy (voice)
- Jeff Bergman - Jonah (voice)
- Kari Wahlgren - Martha (voice)
- Mona Marshall - Sylvia Sundew (voice)
- Susanne Blakeslee - Valeriana (voice)
- Dee Bradley Baker - Bessie (voice)
- Dee Bradley Baker - Archie (voice)
- Bill Kopp - Marnie (voice)
- Jill Bartlett - Maddie Flour (voice)
- Keith Silverstein - Barry (voice)
- Tara Lipinski - Judge 1 (voice)
- April Winchell - Fens (voice)
- April Winchell - Tuti (voice)
- Johnny Weir - Judge 2 (voice)
- Diedrich Bader - Frog Jordan (voice)
- Matt Braly - Chuck (voice)
- Eden Riegel - Wartilda (voice)
- Eden Riegel - Maggie (voice)
- Eden Riegel - Lydia (voice)
- Matt Chapman - Tritonio Espada (voice)
- Tony Hale - Apothecary Gary (voice)
- Katie Crown - Ivy Sundew (voice)
- Stephen Root - Mayor Toadstool (voice)
- James Patrick Stuart - One-Eyed Wally (voice)
- Troy Baker - Captain Grime (voice)
- Brian Maillard - Leopold Loggle (voice)
- Laila Berzins - Sadie Croaker (voice)
- Jack McBrayer - Toadie (voice)
- Kaitlyn Robrock - Felicia Sundew (voice)
- John DiMaggio - Stumpy (voice)
- Darin De Paul - Bog (voice)
- Anna Akana - Sasha Waybright (voice)
- Matt Jones - Percy (voice)
- Susan Egan - Renee Frodgers (voice)
- Max Mittelman - Francis (voice)
- Jenifer Lewis - Mama Hasselback (voice)
- Keith Ferguson - Judro Hasselback (voice)
- Hugh Bonneville - Wigbert (voice)
- Rebecca Sugar - Busker (voice)
- Aisling Bea - Captain Beatrix (voice)
- Keith David - King Andrias (voice)
- Brad Garrett - Robert Otto (voice)
- RuPaul - Mr. X (voice)
- Whoopi Goldberg - Mother Olm (voice)
- Zeno Robinson - Additional Voices (voice)
- Zeno Robinson - Young Andrias (voice)
- Haley Tju - Marcy Wu (voice)
- Wallace Shawn - Humphrey (voice)
- Kate Micucci - Terri (voice)
- Cree Summer - Dr. Frakes (voice)
- Anika Noni Rose - Dr. Jan (voice)
- Cassandra Lee Morris - Leif (voice)
- Jason Ritter - Barrel (voice)
- William Houston - Aldrich (voice)
- Mia Allan - Lavender (voice)
- Mia Allan - Rosemary Flour (voice)
- Marlow Barkley - Rosemary Flour (voice)
- Alex Hirsch - The Curator/Frog Soos (voice)
- Matt Vogel - Crumpet (voice)
- Matt Braly
Brad Garrett interpreta a Robert Otto (voice) en la serie.
Whoopi Goldberg hace el papel de Mother Olm (voice).
Brenda Song interpreta a Anne Boonchuy (voice) en la serie.
Justin Felbinger interpreta a Sprig Plantar (voice) en la serie.
Bill Farmer interpreta a Hopediah Plantar (voice) en la serie.
Amanda Leighton interpreta a Polly Plantar (voice) en la serie.
On Braly interpreta a Mrs. Boonchuy (voice) en la serie.
Brian Sounalath interpreta a Mr. Boonchuy (voice) en la serie.
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