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 Hannibal Buress Flame Prince Guest Voice Grey DeLisle Ice Queen Guest Voice Keith Ferguson Prince Gumball Guest Voice Crispin Freeman Turtle Prince, Ice President Guest Voice Donald Glover Marshall Lee Guest Voice Madeleine Martin Fionna Guest Voice Elle Newlands Butterscotch Butler Guest Voice Emo Philips Cuber, Flour Demon Guest Voice Roz Ryan Cake Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Kristen Mukai Writer Aleks Sennwald Writer Bong Hee Han Director