Pendleton Ward Mushroom Citizen, Goblin, Robber Goblin Creator, Guest Voice Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Dee Bradley Baker Frog Knight, Piglets, Mushroom Magistrate Guest Voice Kent Osborne Kent Goblin, Goblin Bro, Goblin Slave 2 Guest Voice, Writer Davey Johnson Xergiok, Dragon Guest Voice Michael J. Anderson Gummy Guest Voice Maria Bamford Maria Goblin, Old Goblin, Old Lady Goblin Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Larry Leichliter Director Somvilay Xayaphone Writer Jesse Moynihan Writer Cole Sanchez Writer