- Alex Hirsch - Ben Fotino (voice)
- Justin Roiland - Doop-Doop (voice)
- Jessica Paré - Chloe (voice)
- Isabella Gómez - Teenage Mariposa (voice)
- Bryana Salaz - Teenage Meteora (voice)
- Max Mittelman - Wyscan (voice)
- Desus Nice - Pickles (voice)
- The Kid Mero - Needles (voice)
- Gemma Whelan - Solaria Butterfly (voice)
- Corey Burton - Monster Arm (voice)
- Rob Paulsen - Gustav (voice)
- April Winchell - Riddle Sphinx (voice)
- Danny Woodburn - Pixie Taskmaster (voice)
- Anna Camp - Pixie Empress (voice)
- Brian Posehn - Lobster Claws (voice)
- Stephen Root - Brian (voice)
- Gwendoline Yeo - Mrs. Liao (voice)
- Jim Gaffigan - Father Time (voice)
- Jamie Kennedy - Helios (voice)
- Jenny Slate - Pony Head (voice)
- Maurice LaMarche - King Pony Head (voice)
- Jodi Benson - Singing Teacher (voice)
- DeeDee Rescher - Miss Skullnick (voice)
- Matt Chapman - Alfonzo (voice)
- Minae Noji - Brittney Wong (voice)
- Nate Torrence - Ferguson (voice)
- Joshua Rush - Jeremy Birnbaum (voice)
- Jessica Walter - Meteora Heinous (voice)
- Jessica Walter - Miss Heinous (voice)
- Abby Elliott - Janna Ordonia (voice)
- Abby Elliott - Porcupine Monster (voice)
- Michael C. Hall - Toffee (voice)
- Nick Swardson - Sensei (voice)
- Rider Strong - Tom Lucitor (voice)
- Jon Heder - Oskar Greason (voice)
- Jeffrey Tambor - Glossaryck (voice)
- Nia Vardalos - Mrs. Diaz (voice)
- Nia Vardalos - Angie Diaz (voice)
- Mayim Bialik - Willoughby (voice)
- Kimaya Thais - Katrina (voice)
- Kimaya Thais - Additional Voices
- Yvette Nicole Brown - Brigid (voice)
- 'Weird Al' Yankovic - Preston (voice)
- Artt Butler - Mr. Diaz (voice)
- Artt Butler - Rafael Diaz (voice)
- Artt Butler - Rafael Diaz / Vendor (voice)
- Sean Schemmel - Box of Truth (voice)
- Chris Tergliafera - Rasticore (voice)
- Amy Sedaris - Mina Loveberry (voice)
- Amy Sedaris - Lydia (voice)
- Carl Weathers - Omnitraxus Prime (voice)
- Zosia Mamet - Hekapoo (voice)
- Esmé Bianco - Eclipsa (voice)
- Sonny Ashbourne Serkis - Young River Johansen (voice)
- Atticus Shaffer - Dennis (voice)
- Grey DeLisle - Queen Moon Butterfly (voice)
- Grey DeLisle - Jackie Lynn Thomas (voice)
- Grey DeLisle - Queen Moon (voice)
- Grey DeLisle - Queen Moon Butterfly / Jackie Lynn Thomas (voice)
- Grey DeLisle - Queen Butterfly (voice)
- Grey DeLisle - Koala Patron (voice)
- Grey DeLisle - Bird Monster / Additional Voices (voice)
- Jeff Bennett - Principal Skeeves (voice)
- Jeff Bennett - Bearicorn (voice)
- Jeff Bennett - Additional Voices (voice)
- Jeff Bennett - Gemini / Additional Voices (voice)
- Jeff Bennett - Justin Armberg (voice)
- Jeff Bennett - Francis / Justin / Spider Tour Guide (voice)
- Jeff Bennett - Principal Skeeves / Additional Voices (voice)
- Jeff Bennett - Gemini / King Shastacan / Coachman / Additional Voices (voice)
- Jeff Bennett - Francis (voice)
- Jeff Bennett - Bearicorn / Giraffe Monster (voice)
- Jeff Bennett - Gemini (voice)
- Fred Tatasciore - Buff Frog (voice)
- Fred Tatasciore - Talon Raventalon (voice)
- Fred Tatasciore - Elephant Monster / Additional Voices (voice)
- Fred Tatasciore - Quest Buy Sloth Clerks / Old Guy / Additional Voices (voice)
- Fred Tatasciore - Talon (voice)
- Fred Tatasciore - Sloth Worker / Talon Raventalon / Additional Voices (voice)
- Fred Tatasciore - Sloth Employees (voice)
- Fred Tatasciore - Beard Deer (voice)
- Fred Tatasciore - Sloth Worker (voice)
- Fred Tatasciore - Buff Frog / Additional Voices (voice)
- Daron Nefcy - Additional Voices (voice)
- Daron Nefcy - StarFan13 (voice)
- Daron Nefcy - Sabrina (voice)
- Daron Nefcy - Lint Monster / Additional Voices (voice)
- Daron Nefcy - Becky (voice)
- Daron Nefcy - Squirrel Monster / Additional Voices (voice)
- Daron Nefcy - StarFan13 / Additional Voices (voice)
- Dee Bradley Baker - Bald Eagle / Giant Spider (voice)
- Dee Bradley Baker - Mewnian Rats (voice)
- Dee Bradley Baker - Additional Voices (voice)
- Dee Bradley Baker - Lekmet (voice)
- Dee Bradley Baker - Lady Lucitor (voice)
- Dee Bradley Baker - Hydra (voice)
- Dee Bradley Baker - Lekmet / Bald Eagle / Giant Spider / Mewnian Rats (voice)
- Dee Bradley Baker - Yarn Monster (voice)
- Dee Bradley Baker - Bald Eagle / Mewnian Rats / Additional Voices (voice)
- Dee Bradley Baker - King Pigeon / Queen Pigeon / Pigeons / Additional Voices (voice)
- Patrick Stump - Ruberiot (voice)
- Jess Harnell - Old Songstrel (singing voice)
- Greg Cipes - Tad (voice)
- Greg Cipes - Aaron Dominic (voice)
- Jerry Trainor - Roy (voice)
- Dave Allen - Mr. Candle (voice)
- Dave Allen - Sir Crandle (voice)
- Keith David - Glossaryck (voice)
- Mark Gagliardi - Conjoinican (voice)
- Mark Gagliardi - Quirky Guy (voice)
- Mark Gagliardi - Rhombulus' Hands / Pizza Guy (voice)
- Mark Gagliardi - Captain Seabunny (voice)
- Mark Gagliardi - Pizza Guy / Additional Voices (voice)
- Mark Gagliardi - Man Arm (voice)
- Mark Gagliardi - Boo Fly (voice)
- Mark Gagliardi - Additional Voices (voice)
- Mark Gagliardi - Prince Larry Kelpbottom / Additional Voices (voice)
- Mark Gagliardi - Lord Lucitor (voice)
- Mark Gagliardi - Police Officer / Prince / Waiter (voice)
- John DiMaggio - Lord Brudo (voice)
- John DiMaggio - Dogbull (voice)
- John DiMaggio - Additional Voices (voice)
- John DiMaggio - Sea Serpent (voice)
- Arif S. Kinchen - Princess Smooshy / Rat Princess / Additional Voices (voice)
- Arif S. Kinchen - Princess Smooshy (voice)
- Arif S. Kinchen - Rat Princess / Additional Voices (voice)
- Kevin Michael Richardson - Rhombulus (voice)
- Kevin Michael Richardson - Rhombulus / Additional Voices (voice)
- Kevin Michael Richardson - Rhombulus / Platypus Monster / Additional Voices (voice)
- Leigh-Allyn Baker - Mail Monster (voice)
- Leigh-Allyn Baker - Unicorn (voice)
- Eric Bauza - Cloudy (voice)
- Eric Bauza - Additional Voices (voice)
- Eric Bauza - Sir Stabby / Additional Voices (voice)
- Eric Bauza - Cloudy / Additional Voices (voice)
- Eric Bauza - Spider with a Top Hat / Additional Voices (voice)
- Tom Kenny - Additional Voices (voice)
- Tress MacNeille - Lady Avarius (voice)
- Tress MacNeille - Exasperella / Additional Voices (voice)
- Tress MacNeille - St. Olga / Young Meteora / Additional Voices (voice)
- Greg Ellis - Manfred (voice)
- Greg Ellis - Manfred / Additional Voices (voice)
- Danielle Fishel - Librarian (voice)
- Phil LaMarr - Kelly's Dad / Additional Voices (voice)
- Natasha Rothwell - Brunzetta (voice)
- Kate Higgins - Firstborn (voice)
- Kate Higgins - White Baby Unicorn (voice)
- Dana Davis - Kelly (voice)
- Dana Davis - Lady Whosits (voice)
- Dana Davis - Lady Whosits / Additional Voices (voice)
- Dana Davis - Kelly / Kelly's Mom / Additional Voices (voice)
- Dana Davis - Kelly / Lady Whosits (voice)
- Jenna Lea Rosen - Mewni Youth Choir (singing voice)
- Scott Menville - Zeke / Corn Cob Vendor (voice)
- Damon Jones - Sir Lavabo (voice)
- Ralph Ineson - Demoncist (voice)
- Eddie Perino - Seahorse (voice)
- Gary Anthony Williams - Rich Pigeon (voice)
- Gary Anthony Williams - Rich Pigeon / Additional Voices (voice)
- Gary Anthony Williams - Rich Pigeon / Hairy Monster / Additional Voices (voice)
- Lauren Lapkus - Higgs (voice)
- Juliana Hansen - Princess Spiderbite (voice)
- Natalie Palamides - Foolduke (voice)
- Natalie Palamides - Snail (voice)
- Nicole Byer - Princess Arms (voice)
- Nicole Byer - Princess Arms / Princess Jaggs (voice)
- Carol Kane - Dr. Jelly Goodwell (voice)
- David Krumholtz - Cobalt Ferrero (voice)
- James Kyson - Bam Ui Pati Actor (voice)
- Laura Silverman - Krysthalle Pony Head / Additional Voices (voice)
- Bresha Webb - Hornanne Pony Head / Additional Voices (voice)
- Rhys Darby - Eddie (voice)
- Josh Sussman - Sean (voice)
- Josh Sussman - Rock Johansen / Mole Monster / Additional Voices (voice)
- Nika Futterman - Additional Voices (voice)
- Roger Craig Smith - Additional Voices (voice)
- Tony Hale - Pie King / Additional Voices (voice)
- Julian Edwards - Additional Voices (voice)
- Bennett Abara - Princess Quasar (voice)
- Ross Bryant - Reynaldo (voice)
- Kari Wahlgren - Baby Meteora (voice)
- Jaime Camil - Globgor (voice)
- Steve Little - Spider with a Top Hat (voice)
- Ron Lynch - Richard / Flying Pig (voice)
- Chris Redd - Hypnoslumber (voice)
- Maria Bamford - Make-Up Blast (voice)
- Hynden Walch - Babs (voice)
- Will Forte - Tyler / Hunter / Chet / Blue Helmet Kid (voice)
- Bill Hader - Additional Voices (voice)
- Madeleine McGraw - Young Moon Butterfly (voice)
- Susan Bennett - Card (voice)
- Daron Nefcy
- Brian H. Kim
Carl Weathers hace el papel de Omnitraxus Prime (voice).
Jeffrey Tambor interpreta a Glossaryck (voice) en la serie.
Greg Ellis hace el papel de Manfred / Additional Voices (voice).
Eden Sher hace el papel de Star Butterfly (voice).
Adam McArthur interpreta a Marco Diaz (voice) en la serie.
Alan Tudyk hace el papel de Ludo (voice) / King River Butterfly (voice).
Capítulo disponible en las siguientes plataformas:
