Episode Title:Mystery Dungeon.Episode Description:Ice King, N.E.P.T.R. (voiced by Andy Milonakis), Tree Trunks, Shelby (voiced by Pendleton Ward) and Lemongrab (voiced by Justin Roiland) find themselves mysteriously trapped in a dungeon and must band together to get out. Eventually, the Ice King reveals that he kidnapped them so that he could use their individual talents to pass successfully through the maze and meet the Ancient Sleeping Magi of Life Giving so that his fan fiction, Fionna and Cake may become reality.