Finn

Jeremy Shada

Jake

John DiMaggio

Princess Bubblegum

Hynden Walch

The Ice King

Tom Kenny

BMO / Lady Rainicorn (voice)

Niki Yang

N.E.P.T.R.

Andy Milonakis

Moe

Chuck McCann

Science Cat/Ancient Psychic Tandem War Elephant

Steve Agee

King of Ooo

Andy Daly

Banana Guard 16

Tunde Adebimpe

Marceline the Vampire Queen (voice)

Olivia Olson

Cherry Cream Soda Gal

Anne Heche

Sunshine/Jamaica

Ava Acres

Canyon

Ako Castuera

Root Beer Guy/Dirt Beer Guy

Jack Pendarvis

Banana Guards

Dee Bradley Baker

Spirit of the Forest

Matthew Broderick

Hugo/Toughy

Max Charles

The Hierophant

Paul Williams

Cloud Dance

Kyle Kinane

Prismo/The Maid

Kumail Nanjiani

Neddy

Andres Salaff

Gary

Kent Osborne

The Vampire King

Billy Brown

Col. Candy Corn

Keith Ferguson

Toronto

Paul Scheer

Male Computer Voice/Storm

Kevin Michael Richardson

Peppermint Butler/Sensei Paul

Steve Little

Huntress Wizard

Jenny Slate

Me-Mow

Kyla Rae Kowalewski

The Lich

Ron Perlman

Lumpy Space Princess (voice)

Pendleton Ward

Banana Man/Rep. Cybil

Al Yankovic

Bobby

Lou Ferrigno

Clubhouse Sandy

Maria Bamford

AMO

Thu Tran

The Fool

Ron Funches

Viola

Paget Brewster

Mr. Fox/Tin Can Voice/Foxes

Tom Herpich

Tree Trunks (voice)

Polly Lou Livingston

Vice President Blowfish/Shrimp/Seahorse

James Urbaniak

Jake

Jhon Di Maggio

Big Destiny

James Kyson

The Empress

Rebecca Romijn

Mr. Pig

Ron Lynch

The Moon

Beau Billingslea

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

Justin Roiland

Cuber (voice)

Emo Philips

Marceline's Mom

Rebecca Sugar

Breezy (voice) / Blacksmith / Scorpion (voice)

Ashly Burch

Fionna (voice)

Madeleine Martin

Cake (voice)

Roz Ryan

Jake Jr (voice)

Kristen Schaal

Tv (voice)

Dan Mintz

Young Princess Bubblegum (voice)

Isabella Acres

Banana Man (voice)

'Weird Al' Yankovic

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

Andy Samberg