Dipper finds his favorite board game called "Dungeons, Dungeons, and More Dungeons", and Great Uncle Ford joins him. However, when Grunkle Stan accidentally rolls Ford's Infinity-Sided Dice he found in a different dimension, the characters from the game come to life and capture Dipper and Ford. Meanwhile, Mabel, Grunkle Stan and Grenda try to watch the Ducktective season finale.
Guest stars: "Weird Al" Yankovic as Probabilitor, J. K. Simmons as Stanford Pines