Finn

Jeremy Shada

Jake the Dog (voice)

John DiMaggio

Princess Bubblegum

Hynden Walch

The Ice King

Tom Kenny

BMO / Lady Rainicorn (voice)

Niki Yang

Marceline

Olivia Olson

Lumpy Space Princess

Pendleton Ward

N.E.P.T.R.

Andy Milonakis

Guest Voice

Jeff Bennett

Guest Voice

Dee Bradley Baker

Charlie

Alia Shawkat

Merchant/Science Cat/Spiky Person 1

Steve Agee

Susan Strong

Jackie Buscarino

Alva

Helena Mattsson

Gunther

Pamela Adlon

Flame Prince

Hannibal Buress

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

Justin Roiland

Bronwyn

Rae Gray

James Baxter

James Baxter

Fern

Hayden Ezzy

Rattleballs/Sparkle

Rainn Wilson

Guest Voice

Maria Bamford

Tv (voice)

Dan Mintz

Ice Queen

Grey Griffin

Sharon/Spear Bear/Spiky Person 2

Melinda Hill

Betty Grof

Lena Dunham

Water Nymph 1/Water Nymph 3

Katie Crown

Tiffany

Collin Dean

Teenage Fox

Tom Herpich

Guest Voice

Polly Lou Livingston

Bob Rainicorn

Henry Rollins

Minerva/Minerva Bot

Sharon Horgan

Grand Prix

Rich Sommer

Prince Gumball

Keith Ferguson

Kim Kil Whan

Marc Evan Jackson

Nurse Poundcake

Steve Little

Dr. Gross

Lennon Parham

Whipple

Josh Fadem

Guest Voice

Melissa Villaseñor

Guest Voice

Cole Sanchez

Guest Voice

Kent Osborne

Ethel Rainicorn

Laura Silverman

Bandit Princess

Amy Sedaris

Turtle Prince/Ice President

Crispin Freeman

Flame Princess

Jessica DiCicco

Turtle Announcer

Reggie Watts

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

Ava Acres

Jerky Teenage Bear

Sam Marin

Young Kara

Livvy Stubenrauch

KidsJackie Buscarino:Kara

ViviAnn Yee

Music Hole

Ashley Eriksson

Widow

Laraine Newman

Chatsberry

Alan Tudyk

Frieda

Jasika Nicole

Marshall Lee

Donald Glover

Patience St. Pim

Lauren Lapkus

Roy

Fred Stoller

Fionna (voice)

Madeleine Martin

Prismo (voice)

Kumail Nanjiani

Martin

Stephen Root

Breezy (voice) / Blacksmith / Scorpion (voice)

Ashly Burch

Butterscotch Butler

Elle Newlands

Lee

Bert Youn

Cuber/Flour Demon

Emo Philips

Flame King

Keith David

Jhon Di Maggio

Cake (voice)

Roz Ryan

Spirit of the Forest

Matthew Broderick

Huntress Wizard

Jenny Slate

Jake Jr (voice)

Kristen Schaal

Young Princess Bubblegum (voice)

Isabella Acres

Banana Man (voice)

'Weird Al' Yankovic

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

Andy Samberg