Finn

Jeremy Shada

Jake

John DiMaggio

Princess Bubblegum (voice)

Hynden Walch

The Ice King

Tom Kenny

BMO / Lady Rainicorn (voice)

Niki Yang

Root Beer Guy

Jack Pendarvis

Flame Princess

Jessica DiCicco

Marceline the Vampire Queen (voice)

Olivia Olson

Shoko

Isabelle Fuhrman

James

Andy Merrill

Braco

Johnny Pemberton

Fear Feaster/Jordan

Mark Hamill

Old Marceline

Cloris Leachman

Banana Man

"Weird Al" Yankovic

Moe

Chuck McCann

Choose Goose/Wizard of Grassy Mountain

Jeff Bennett

Grand Master Wizard/Wizard Police 1

Maurice LaMarche

Maja

Jill Talley

Bubble

LeVar Burton

Margaret/Kim Kil Whan

Maria Bamford

Fionna (voice)

Madeleine Martin

Phlannel Boxingday

Creed Bratton

Cosmic Owl

M. Emmet Walsh

Jake Jr.

Kristen Schaal

Party Pat/Rap Bear

Andy Samberg

Jay

Max Charles

Bath Boy Boss

Paul Scheer

Ogdoad

James Adomian

Cherry Cream Soda

Anne Heche

Betty Grof

Lena Dunham

Young Marceline (voice) / Candy Kids (voice) / Young Marceline

Ava Acres

The Lich

Ron Perlman

Owl/Porcupine/Lenny the Beaver

Jim J. Cummings

Davey

Davey Johnson

Tree Trunks (voice)

Polly Lou Livingston

Gumdrop Guy

Christopher Monahan

Kee-Oth

Noah Nelson

Billy

Lou Ferrigno

Adult Finn

Jonathan Frakes

Flame King

Keith David

Finn's Mom

Ming-Na

Magus of Life-Giving

Dana Snyder

Goblin Guard 2

Kevin Michael Richardson

DMO

Aziz Ansari

Earl of Lemongrab (voice) / Lemongrab 2 (voice) / Lemonpink (voice)

Justin Roiland

Sparkle's Mom/Ladybug/Mama Bird

Jessica Anne Bogart

Blargatha

Katie Crown

Hypno Priest/Mo-Mo

Phil LaMarr

Squirrel

Marc Maron

Prince Gumball

Neil Patrick Harris

Randy

Randy Liedtke

Lumpy Space Princess (voice)

Pendleton Ward

James Baxter

James Baxter

Sue/Candle Hooligans

Tamar Stevens

Cuber (voice)

Emo Philips

N.E.P.T.R.

Andy Milonakis

SMO Captain/SMO 2

Paul F. Tompkins

Ash

Steve Agee

Tv (voice)

Dan Mintz

Peppermint Butler

Steve Little

Elder Plops

John Hodgman

Marshall Lee

Donald Glover

Gareth/Flying Lettuce Brother

Sam Marin

Don John

Roddy Piper

Ron James/Wizard Prison Inmate

Duncan Trussell

Clerk

Melissa Villaseñor

Mr. Fox

Tom Herpich

Canyon

Ako Castuera

Guest Voice

Kent Osborne

Cake (voice)

Roz Ryan

Cinnamon Bun

Dee Bradley Baker

Samantha

Marina Sirtis

Rattleballs

Rainn Wilson

Roselinen/Adult Bonnie

Mandy Siegfried

Prismo (voice)

Kumail Nanjiani

Death

Miguel Ferrer

Pizza Sassy/Blueberry Cop 2

Howard Kremer

Guest Voice

Shyloh Oostwald

Tiffany

Collin Dean

Big Destiny/Trami

James Kyson

Guest Voice

Eric Bauza

Johnnie

Mark Proksch

Snow Monsters

John Kassir

Island Lady

Riki Lindhome

Party God

Cole Sanchez

King of Ooo/Wyatt

Andy Daly

Mr. Pig

Ron Lynch

Breezy (voice) / Blacksmith / Scorpion (voice)

Ashly Burch

Young Princess Bubblegum (voice)

Isabella Acres

Banana Man (voice)

'Weird Al' Yankovic