On screen
Cast
81 credited performers
Madeleine Martin
Fionna (voice)
Roz Ryan
Cake (voice)
Tom Kenny
Simon Petrikov / Banana Guard #2 (voice)
Dee Bradley Baker
Frasier / Snail / Yellowsweets (voice)
Jeremy Shada
Babyworld Finn (voice)
Pendleton Ward
Ellis P / Alien Robot (voice)
Hynden Walch
Princess Bubblegum (voice)
Kayleigh McKee
Scarab / Ashley (voice)
Ashly Burch
Huntress Wizard (voice)
Harvey Guillén
Gary (voice)
Vico Ortiz
Hunter / Skater Y (voice)
Maria Bamford
Starchy (voice)
Sean Rohani
Prismo (voice)
Olivia Olson
Marceline / Celine (voice)
Kris Kollins
Marshall Lee (voice)
Jinkx Monsoon
Lemoncarb #1 / Carla (voice)
Manny Jacinto
DJ Flame / Flame Prince (voice)
Chelsea Peretti
Frozen Turkey (voice)
Donald Glover
Marshall Lee / Monster Marshall (voice)
Andrew Rannells
Gary Prince / Monster Gary (voice)
Audrey Bennett
Astrid / Bus Kid (voice)
Erica Luttrell
Hana Abadeer (voice)
Cree Summer
Additional Voices (voice)
Niki Yang
BMO (voice)
Grey DeLisle
Ice Cream Queen / Rink Attendant (voice)
Andy Daly
Cliff / Hourglass (voice)
Steve Little
Peptank / Sam (voice)
Matthew Broderick
Spirit Dream Warrior (voice)
Cole Sanchez
Party God / Person 1 (voice)
Anna Akana
Fennel / Sound Guy (voice)
Jeff Bennett
Additional Voices (voice)
Marc Maron
Additional Voices (voice)
Erica Mendez
Skater Fairies (voice)
Will Pendarvis
DJ Slime (voice)
Cristina Valenzuela
Skater Fairies (voice)
Felicia Day
Betty (voice)
Phil LaMarr
Additional Voices (voice)
Dave McCormack
Orbo (voice)
Mace Montgomery Miskel
Pep (voice)
Patti Harrison
Witch Wizard (voice)
Sharon Horgan
Minerva / Minervabot (voice)
Rosie Brand
Tree Wizard / Kirin (voice)
Kumail Nanjiani
Prismo (voice)
Mickey Zacchilli
Everplant / Little Destiny (voice)
Frank Collison
Cosmic Owl / Brother #1 (voice)
Rumi C. Jean-Louis
Young Marshall Lee (voice)
Open Mike Eagle
Marshmallow Kid (voice)
Kent Osborne
Damon (voice)
Andy Merrill
Blade Wizard / Banana Guard #3 (voice)
Dan Mintz
TV (voice)
John DiMaggio
Jake (voice)
Robbie Daymond
TV Announcer (voice)
Melissa Villaseñor
Candy Cuffs (voice)
Ron Perlman
Lich (voice)
Tiffany Wu
Additional Voices (voice)
Sean Giambrone
Shermy (voice)
Imani Hakim
Beth (voice)
Eric Bauza
Peanut / Banana Guard #1 (voice)
James Kyson
Big Destiny / Handbag Helmet (voice)
Billy Brown
Vampire King (voice)
Aleks Sennwald
Venus Cosmic (voice)
Elle Newlands
Beatrice Buttler / Van Driver (voice)
Jack Pendarvis
Dirt Beer Guy (voice)
Jim Cummings
Additional Voices (voice)
Brian David Gilbert
Winter King / Singing Banana Guard (voice)
Jenny Slate
Huntress (voice)
Stephen Root
Martin Mertens (voice)
Iggy Craig
Casper (voice)
Nia Castro
Bonnie (voice)
Colleen Smith
Frankie / Lady Cutter (voice)
Crispin Freeman
Turbo Allen (voice)
Jessica DiCicco
Flame Princess (voice)
Joe Pera
Gordie (voice)
Thurop Van Orman
Wishy / Spider (voice)
Kerri Kenney
Old Lady Princess / MS. Cupcake / Lips Monster (voice)
Kari Wahlgren
Queen of Venus / Embolina (voice)
Gaby Moreno
Venus Cantrix (voice)
Hayden Ezzy
Fern (voice)
Martin Olson
Hunson Abadeer (voice)
Bex Taylor-Klaus
Blaine (voice)
Andy Milonakis
Neptr / Vampire #2 (voice)