Fionna Campbell (voice)

Madeleine Martin

Cake (voice)

Roz Ryan

Simon Petrikov / Ice King (voice)

Tom Kenny

Gary Prince (voice) / Gary Prince / Monster Gary (voice)

Andrew Rannells

Additional Voices (voice) / Cinnamon Bun Mutant / Banana Guard Mutant #2 & #3 (voice)

Dee Bradley Baker

Marshall Lee (voice) / Marshall Lee / Monster Marshall (voice)

Donald Glover

Scarab (voice) / Scarab / Miss Rabow (voice)

Kayleigh McKee

Prismo (voice) / Prismo / Burger (voice)

Sean Rohani

Astrid (voice) / Young Marceline / Young Marceline (voice)

Audrey Bennett

Jake (voice)

John DiMaggio

Queenie (voice)

Chelsea Peretti

Finn / Woodpecker / Coffee Guy (voice)

Jeremy Shada

Ellis P (voice) / Ellis P / Old Man Cake

Pendleton Ward

Additional Voices (voice) / Normulon / Lemongrab (voice)

Jinkx Monsoon

Starchy (voice) / Additional Voices (voice) / Farmworld Mom

Maria Bamford

Evil Choose Goose (voice) / Choose Bruce / Earmworld Dad (voice)

Jeff Bennett

Skater Fairies (voice) / Ice Scout #2 (voice) / Additional Voices (voice)

Cristina Valenzuela

Skater Fairies (voice) / Ice Scout #1 (voice) / Additional Voices (voice)

Erica Mendez

Additional Voices (voice) / Lemoncarb #2 (voice)

Cree Summer

Betty (voice)

Felicia Day

Princess Bubblegum / Child Wizard / Tourist #3 (voice)

Hynden Walch

Dog Cake / Nightmare Cake / Beard Guy (voice)

Phil LaMarr

Hunter / Skater Y (voice) / Fern (voice)

Vico Ortiz

Marceline (voice)

Olivia Olson

Additional Voices (voice)

Sharon Horgan

BMO / Library Person (voice) / Additional Voices (voice)

Niki Yang

Ice Prince / TV Announcer / Bar Guy (voice)

Robbie Daymond

Additional Voices (voice) / Ice Cream Queen / Rink Attendant (voice)

Grey DeLisle

Squirrel (voice) / Additional Voices (voice)

Marc Maron

Kheirosiphon / Wyatt (voice) / Popcop (voice)

Andrew Daly

Babette / Heckler #1 (voice) / Candy Cuffs (voice)

Melissa Villaseñor

Additional Voices (voice)

Steve Little

Additional Voices (voice) / Moderator / Heckler #2 (voice)

Cole Sanchez

Little Destiny (voice) / Additional Voices (voice)

Mickey Zacchilli

Lich (voice)

Ron Perlman

Jay / Finn's Kid #2 (voice) / Additional Voices (voice)

Tiffany Wu

Shermy (voice)

Sean Giambrone

Beth (voice)

Imani Hakim

Beatrice Buttler / Van Driver (voice)

Elle Newlands

TV (voice)

Dan Mintz

Dirt Beer Guy (voice)

Jack Pendarvis

Additional Voices (voice)

Jim Cummings

Peanut / Tromo / Tire Seller (voice)

Eric Bauza

Big Destiny / Handbag Helmet (voice)

James Kyson

Winter King / Singing Banana Guard (voice)

Brian David Gilbert

Huntress (voice)

Jenny Slate

Hana Abadeer (voice)

Erica Luttrell

Martin Mertens (voice)

Stephen Root

Vampire King (voice)

Billy Brown

Orbo (voice)

Dave McCormack

Casper (voice)

Iggy Craig

Nova (voice)

Rosie Brand

Bonnie (voice)

Nia Castro