Fionna Campbell (voice)
Madeleine Martin
Cake (voice)
Roz Ryan
Simon Petrikov / Ice King (voice)
Tom Kenny
Additional Voices (voice) / Reindeer Boy Boss / Farmworld Chet
Dee Bradley Baker
Scarab (voice) / Scarab / Ashley (voice)
Kayleigh McKee
Marshall Lee (voice) / Marshall Lee / Monster Marshall (voice)
Donald Glover
Gary Prince (voice) / Gary Prince / Monster Gary (voice)
Andrew Rannells
Farmworld Finn / Ice Finn (voice) / Finn (voice)
Jeremy Shada
Ellis P (voice) / LSP / Ellis P
Pendleton Ward
Additional Voices (voice) / Normulon / Lemongrab (voice)
Jinkx Monsoon
Astrid (voice) / Young Marceline / Young Marceline (voice)
Audrey Bennett
Farmworld Mom / Wildberry / Finn's Kid #1 (voice)
Maria Bamford
Evil Choose Goose (voice) / Choose Bruce / Earmworld Dad (voice)
Jeff Bennett
Additional Voices (voice) / Skater Fairies (voice) / Ice Scout #2 (voice)
Cristina Valenzuela
Additional Voices (voice) / Skater Fairies (voice) / Ice Scout #1 (voice)
Erica Mendez
Additional Voices (voice) / Lemoncarb #2 (voice)
Cree Summer
Betty (voice)
Felicia Day
Bonnie (voice) / Princess Bubblegum / Child Wizard
Hynden Walch
Goo Zombies / Dog Tourist / Tourist #4 (voice)
Phil LaMarr
Hunter / Fern (voice) / Skater Y (voice)
Vico Ortiz
Queenie (voice)
Chelsea Peretti
Marceline (voice)
Olivia Olson
Jake (voice)
John DiMaggio
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
Candy Cuffs (voice) / Babette / Heckler #1 (voice)
Melissa Villaseñor
Additional Voices (voice)
Steve Little
Moderator / Heckler #2 (voice) / Additional Voices (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
Prismo (voice) / Prismo (1
Sean Rohani