Pendleton Ward Lumpy Space Princess, Jellyfish Creator, Guest Voice Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Niki Yang BMO Guest Voice Olivia Olson Marceline, Demon Guest Voice Eric Bauza The Bear, Candy Person Guest Voice Martin Olson Evil Marceline, Charlic, Hunson Abadeer Guest Voice Cole Sanchez Purple Bug Guest Voice, Writer Maria Bamford Wildberry Princess, Candy Girl, Marshallow Kid Guest Voice Tom Gammill Glob Guest Voice Steve Little Peppermint Butler Guest Voice Jessica DiCicco Flame Princess Guest Voice Jill Talley Hug Wolf, Beautiful Lady, Gumdrop Daughter Guest Voice Dee Bradley Baker Cinnamon Bun, Cow, Candy Person Guest Voice Andy Milonakis N.E.P.T.R. Guest Voice Henry Linehan Stormo Guest Voice Kent Osborne Bird, Goblins Guest Voice Jonathan Katz The Elder Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Larry Leichliter Director Tom Herpich Writer Ako Castuera Writer Skyler Page Writer Jesse Moynihan Writer Steve Wolfhard Writer Rebecca Sugar Writer Somvilay Xayaphone Writer Bert Youn Writer