Pendleton Ward Lumpy Space Princess, Two Headed Cutie, Cutie Creator, Guest Voice, Writer Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Olivia Olson Marceline Guest Voice Isabella Acres Young Princess Bubblegum Guest Voice Madeleine Martin Fionna Guest Voice Niki Yang BMO Guest Voice Dee Bradley Baker Cinnamon Bun, Cutie, Fight King Guest Voice Melissa Villaseñor Rainy, Ham Sandwich Guest Voice Steve Agee Rag Wizard, Ash, Cherry Blossom Ghost Guest Voice Maurice LaMarche Grand Master Wizard, Weaponhead Guest Voice Maria Bamford Manifred, Chocoberry Guest Voice Jackie Buscarino Cute King Guest Voice Jessica DiCicco Flame Princess, Flame People Guest Voice Grey DeLisle Achillea, Amazonia Guest Voice Steve Little Peppermint Butler Guest Voice Kent Osborne Triumphus Guest Voice, Writer Cole Sanchez Pagelings, Moldos Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Larry Leichliter Director Ako Castuera Writer Tom Herpich Writer Somvilay Xayaphone Writer Jesse Moynihan Writer Adam Muto Writer Natasha Allegri Writer Rebecca Sugar Writer Bert Youn Writer Bong Hee Han Director