Star Butterfly

Eden Sher

Star Butterfly (voice)

Adam McArthur

Marco Diaz (voice)

Alan Tudyk

Ludo / King River Butterfly (voice)

Grey DeLisle

Queen Moon Butterfly / Jackie Lynn Thomas (voice)

Fred Tatasciore

Sloth Worker (voice)

Esmé Bianco

Eclipsa (voice)

Abby Elliott

Porcupine Monster (voice)

Rider Strong

Tom Lucitor (voice)

Jeff Bennett

Bearicorn (voice)

Jenny Slate

Pony Head (voice)

Artt Butler

Rafael Diaz (voice)

Zosia Mamet

Hekapoo (voice)

Dee Bradley Baker

Additional Voices (voice)

Mark Gagliardi

Rhombulus' Hands / Pizza Guy (voice)

Jeffrey Tambor

Glossaryck (voice)

Daron Nefcy

Squirrel Monster / Additional Voices (voice)

Kevin Michael Richardson

Rhombulus / Platypus Monster / Additional Voices (voice)

Dana Davis

Lady Whosits (voice)

Michael C. Hall

Toffee (voice)

Jon Heder

Oskar Greason (voice)

Nia Vardalos

Mrs. Diaz (voice)

Eric Bauza

Additional Voices (voice)

Keith David

Glossaryck (voice)

Nate Torrence

Ferguson (voice)

Jessica Walter

Miss Heinous (voice)

Amy Sedaris

Mina Loveberry (voice)

DeeDee Rescher

Miss Skullnick (voice)

Kimaya Thais

Katrina (voice)

Carl Weathers

Omnitraxus Prime (voice)

Matt Chapman

Alfonzo (voice)

Nick Swardson

Sensei (voice)

Natalie Palamides

Snail (voice)

Patrick Stump

Ruberiot (voice)

Eddie Perino

Seahorse (voice)

John DiMaggio

Lord Brudo (voice)

Joshua Rush

Jeremy Birnbaum (voice)

Dave (Gruber) Allen

Mr. Candle (voice)

Greg Cipes

Tad (voice)

Tress MacNeille

Lady Avarius (voice)

Kate Higgins

White Baby Unicorn (voice)