Pendleton Ward Lumpy Space Princess Creator, Voice Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Olivia Olson Marceline Voice Niki Yang BMO Guest Voice Livvy Stubenrauch Bonnibel Guest Voice Fred Melamed Gumbald Guest Voice Maria Bamford Aunt Lolly, Manfried Guest Voice Tom Herpich Goblin Guest Voice Andres Salaff Neddy Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Hanna Nystrom Writer Aleks Sennwald Writer