Finn the Human (voice)

Jeremy Shada

Jake the Dog (voice)

John DiMaggio

Princess Bubblegum

Hynden Walch

Ice King (voice)

Tom Kenny

BMO / Lady Rainicorn (voice)

Niki Yang

Marceline

Olivia Olson

Lumpy Space Princess

Pendleton Ward

Tree Trunks (voice)

Polly Lou Livingston

Warren Ampersand

Dave Foley

Peppermint Butler

Steve Little

Aunt Lolly/Slime Princess

Maria Bamford

Flame Princess

Jessica DiCicco

Gumbald/Punchbowl

Fred Melamed

Marceline

Martin Olson

Pudding Troll

Steve Berg

Huntress Wizard

Jenny Slate

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

Justin Roiland

Fern/Grass Demon

Hayden Ezzy

N.E.P.T.R.

Andy Milonakis

Grumbo/Banana Guard

Dee Bradley Baker

Mr. Pig

Ron Lynch

Toronto/Victor Marilyn

Paul Scheer

The Green Knight

Brad Neely

Head Ghost Thug

Cole Sanchez

Rap Bear

Rekstizzy

Col. Candy Corn

Keith Ferguson

Kim Kil Whan

Marc Evan Jackson

Life-Giving Magus

Dana Snyder

Wishy

Thurop Van Orman

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

Ava Acres

Joshua

Kent Osborne

Son of Rap Bear

Jonathan Park

Shermy

Sean Giambrone

Beth

Willow Smith

Prismo (voice)

Kumail Nanjiani

Guest Voice

Mike Eagle

Cuber (voice)

Emo Philips

Jermaine

Tom Scharpling

Flame King

Keith David

Breezy (voice) / Blacksmith / Scorpion (voice)

Ashly Burch

Sweet P

Ethan Maher

Mark Hamill

Betty Grof

Felicia Day

Fionna (voice)

Madeleine Martin

Randy

David Herman

Clancy Brown

Bonnibel

Livvy Stubenrauch

Cake (voice)

Roz Ryan

Jake Jr (voice)

Kristen Schaal

Danny

Raza Jaffrey

Wyatt/King of Ooo

Andrew Daly

Tv (voice)

Dan Mintz

Goblin

Tom Herpich

Young Princess Bubblegum (voice)

Isabella Acres

Neddy

Andres Salaff

Banana Man (voice)

'Weird Al' Yankovic

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

Andy Samberg