Billy's dad has got a new job, and he and his family are going to move to another town. However, by Billy's relocating, he and Mandy will have a problem - when Billy is in another town, he and Mandy will not be able to both share their slave - the Grim Reaper. Who gets to "keep" Grim? Should Billy be the "sole" owner of Grim, and take him with him upon moving, or should Grim be given to Mandy, and stay with her? To resolve this, they take their dispute to the Underworld Court to solve their porblem like "spoiled adults," instead of arguing "like spoiled children". There, a jury of "disgusting, nightmarish monsters" (including Fred Fredburger) will decide once and for all who is truly the "Keeper of the Reaper". A lengthy, tedious debate with appearances of Irwin, Jeff the Spider, Eris, Li'l Porkchop, and other assorted characters, and a burst of song follows. But when the final decision on who would get to keep Grim came, it turned out to be in the hands of, none other than, Fred Fredburger. He answered by saying, "Yes!" no matter what question was asked; Judge Spleen interpreted this to mean that "Grim shouldn't be separated from either Billy or Mandy, because that would destroy their friendship, and friendship is our most personal treasure... even more personal than our toothbrush." After declaring that Fred's words had "moved [his] crusty heart," Judge Spleen immediately placed Billy's family under house arrest and confined to their property, so that they could not move.