Pendleton Ward Lumpy Space Princess, Father Alien Creator, Guest Voice Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Melissa Villaseñor Mother Alien, Green Alien Guest Voice Matt Gourley Granny Elder, Pops Elder Guest Voice Stephen Root Martin Guest Voice Cole Sanchez Martin 2, Koala People, Guards Guest Voice, Writer Tipper Newton Emperor, Head Guard, Turtle Guest Voice Dee Bradley Baker Barkeep, Large Prisoner, Koala People Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Graham Falk Writer Seo Jung Kim Writer Somvilay Xayaphone Writer