Jeremy Shada

Finn the Human (voice)

John DiMaggio

Jake the Dog (voice)

Tom Kenny

Ice King (voice)

Hynden Walch

Princess Bubblegum (voice)

Olivia Olson

Marceline the Vampire Queen (voice)

Niki Yang

BMO / Lady Rainicorn (voice)

Pendleton Ward

Lumpy Space Princess (voice)

Polly Lou Livingston

Tree Trunks (voice)

Ava Acres

Sunshine / Jamaica (voice), Young Marceline / Bunny Girl (voice), Young Marcy (voice), Candy Kids (voice), Young Marceline (voice), Candy Girl (voice), Jamaica (voice)

Justin Roiland

Earl of Lemongrab (voice) / Starfish Martian (voice), Lemonpink (voice) / Gummy Fish (voice), Lemonpink (voice), Earl of Lemongrab (voice) / Lemongrab 2 (voice), Earl of Lemongrab (voice)

Kumail Nanjiani

Prismo (voice)

Emo Philips

Cuber (voice)

Ashly Burch

Blacksmith / Scorpion (voice), Cheryl / Celina / Super Porp Mutant (voice), Celina / Cheryl (voice), Breezy (voice)

Madeleine Martin

Fionna (voice)

Roz Ryan

Cake (voice)

Kristen Schaal

Jake Jr (voice)

Dan Mintz

Tv (voice)

Isabella Acres

Young Princess Bubblegum (voice)

'Weird Al' Yankovic

Banana Man (voice)

Andy Milonakis

Neptr (voice)

Andy Samberg

Party Pat / Rap Bear (voice), Party Splat (voice), Party Pat (voice)

Neil Patrick Harris

Prince Gumball (voice)

Mark Hamill

Dark Magician (voice)

M. Emmet Walsh

Cosmic Owl (voice)

Kevin Michael Richardson

Donny (voice), The Storm (voice), Additional Voices (voice)

Lou Ferrigno

Billy (voice)

Kent Osborne

Bounce House Princess (voice), Additional Voices (voice)

Henry Rollins

Cookie (voice), Bob Rainicorn (voice)

Steve Little

Zombie Candy Heart / Peppermint Butler / Gumball Guardian #2 (voice), Abracadaniel (voice)

Lauren Lapkus

Patience St. Pim (voice)

Kyla Kowalewski

Me-Mow (voice)

James Urbaniak

Vice President Blowfish (voice), Rat King / Leaf Beard (voice)

George Takei

Ricardio (voice)

Thurop Van Orman

Kent (voice), Tree Witch (voice)

Donald Glover

Marshall Lee (voice)

Grey DeLisle

Ice Queen (voice)

Ako Castuera

Canyon (voice)

Laura Silverman

Ethel Rainicorn (voice)

John Hodgman

Elder Plops (voice), DJ Plop Drops (voice)

Kate Micucci

Wendy (voice), Chips (voice)

Riki Lindhome

Island Lady (voice), Ice Cream (voice)

Sharon Horgan

Minerva (voice)

Jenny Slate

Huntress Wizard (voice)

Jackie Buscarino

Eclair Boy (voice), Susan Strong / Kara / Additional Voices (voice)

Felicia Day

Betty (voice)

Keith David

Flame King (voice), Balthus (voice)

Dee Bradley Baker

Additional Voices (voice), Mr. Cream Puff / Mr. Cupcake / Chet (voice)

Maurice LaMarche

Grand Master Wizard (voice), Wizard Police (voice)

Alan Tudyk

Chatsberry (voice)

Cole Sanchez

Party God (voice), Additional Voices (voice)

Livvy Stubenrauch

Young Kara (voice), Bonnibel (voice)

Paul Reubens

Gnome Ruler/Dancing Bug (voice)

Susie Essman

Ron Lynch

Brian Posehn

Biz Markie

Bobcat Goldthwait

Billy West

Goose / Erik Adamkinson / Mayor (voice)

Brian Doyle-Murray

Prince Huge (voice)

Alan Oppenheimer

Darren the Ancient Sleeper/Sun (voice)

Beau Billingslea

The Moon (voice)

Eric Bauza

Buttersotch Butler (voice)

Willow Smith

Beth (voice)

Sean Giambrone

Shermy (voice)

Brian Baumgartner

Georgy / Private (voice)

Toby Huss

Booboo / Commander (voice)

David Ferguson

Lifeguard (voice)

Hannibal Buress

Flame Prince (voice)

Crispin Freeman

Turtle Prince (voice)

Peter Serafinowicz

Lumpy Space Prince (voice)

Elle Newlands

Butterscotch Butler (voice)

Matthew Broderick

Dream Warrior (voice)

Bert Youn

Lee (voice)

Fred Stoller

Roy (voice)

Donald Faison

Princess Cookie (voice)

Kay Lenz

Bird Woman (voice)

Maria Bamford

Manfried / Chocoberry / Candy Corn Girl (voice)

Mark Proksch

Johnnie (voice)

Marc Maron

Squirrel (voice)

LeVar Burton

Bubble (voice)

Melissa Villaseñor

Clerk (voice)

Lucy Lawless

General Tarsal (voice)

Alia Shawkat

Betsy (voice)

Chelsea Peretti

Queen of Ooo (voice)

Paul Scheer

Toronto (voice)

Dave Foley

Warren Ampersand (voice)

James Baxter

James Baxter (voice)

J.G. Quintel

Blue Jay (voice)

John Moschitta Jr.

Key-per (voice)

Sam Marin

Gareth / Flying Lettuce Brother (voice)

Collin Dean

Tiffany (voice)

Steve Agee

Ash (voice)

Martin Olson

Hunson Abadeer (voice)

Pamela Adlon

Gunther (voice)

Creed Bratton

Phlannel Boxingday (voice)

Open Mike Eagle

Gingerbread Rapper / Rapper Chipmunk (voice)

Stephen Root

Martin (voice)

Laraine Newman

Widow / Additional Voices (voice)

Lennon Parham

Additional Voices (voice)

Steve Wolfhard

Slimy D (voice)

Davey Johnson

Xergiok (voice)

Zach King

Fizzbang (voice)

Ron Perlman

The Lich (voice)