In a recent episode of Gravity Falls, the astrophysicist voiced a pig who becomes intelligent after eating some brain-enhancing “goop” and building a machine that gives him the ability to talk.

The episode, “Little Gift Shop of Horrors,” will see Mabel’s pet pig, Waddles (Tyson), accidently eating a bowl of brain-enhancing jelly, after which he builds a machine that allows him to speak for ...