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 Steve Berg Pudding Troll Guest Voice Andy Milonakis N.E.P.T.R. Guest Voice Thurop Van Orman Wishy Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Sam Alden Writer Patrick McHale Writer