Pendleton Ward Double-Headed Demon, Demon, Abs Demon Creator, Guest Voice Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Olivia Olson Marceline, Demon Guest Voice Martin Olson Evil Marceline, Charlic, Hunson Abadeer Guest Voice Steve Agee Charlic's Dad, Demon Guest Voice Kent Osborne Nightosphere Jailer Guest Voice Dee Bradley Baker Half Monster Demon, Boat Demon, Big Demon Guest Voice Niki Yang BMO Guest Voice Cole Sanchez Coffee Demon, Demon Guest Voice, Writer Fred Seibert Executive Producer Kelly Crews Producer Larry Leichliter Director Ako Castuera Writer Jesse Moynihan Writer Rebecca Sugar Writer