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 Steve Agee Merchant, Science Cat, Spiky Person 1 Guest Voice Melinda Hill Sharon, Spear Bear, Spiky Person 2 Guest Voice Steve Little Cameron Guest Voice Amy Sedaris Bandit Princess Guest Voice Niki Yang BMO Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Sam Alden Writer Jesse Moynihan Writer