Hey, it’s a character voiced by “Weird Al” Yankovic!
Dipper has competition: the season finale of Ducktective has enthralled Stan and Mabel, and all he wants to do is play his favorite board game of Dungeons, Dungeons, And More Dungeons. It involves a lot of math and probability. Mabel might be down if the hot elf or the unicorn on the cover were involved, but much of it involves throwing dice, particularly a 38-sided one.
As it is, Dipper has only Gompers the goat to play with at first, and all Gompers wants to do is eat the dice. Fortunately, in a manner that doesn’t sound fortunate at all, Dipper falls through a hole into Uncle Ford’s lab. Good news! Dungeons, Dungeons, and More Dungeons is also Ford’s favorite game! He’ll play with Dipper!
Heck, Ford even has something special from his interdimensional travels…an infinite-sided dice! Careful! If it gets rolled, literally anything can happen.
That proves true when Stan, Mabel, and Grenda show up to see the crime-fighting duck and find Ford and Dipper have taken over the TV room with a lot of graph paper. Stan and Ford argue, the infinite dice falls, and…the characters on the box come to life: a griffin, an ogre, the Hot Elf, and evil wizard Probabilitor (Yankovic).
What does Probabilitor want? He wants to eat Ford and Dipper’s brains to get smarter. Makes sense.
That means after the weirdoes from the role playing game run away that it’s up to Stan, Mabel, and Grenda to save them. They arm themselves. Stan gets a bat. Mabel gets a rake. Grenda picks up a recliner. Off they go and first they need to get past the ogre and his seven challenges…or Grenda can knock him out with that recliner. Either works.
To save their respective brothers, though, Stan and Mabel need to beat the wizard at…Dungeons, Dungeons, and More Dungeons. Can they? Well, to win, you need to be an unscrupulous gambler (that’d be Stan) and have a vivid imagination (and that checks Mabel). So, there’s dice throwing and ridiculously cute (but lethal) weapons. And then it comes down to Stan needed to throw a perfect 38. Can he? Yes, and Probabilitor goes back into the game.
And of course Stan cheated.
So, Dipper gets to see the show with the rest of his family (where it reveals that Ducktective has a twin brother…everyone saw that coming), and Ford reveals his experiments deal with disassembling the dimensional portal, though there is a catch. See, there’s a snow globe sized bit of instability…