Gravity Falls Episode 20 Gideon Rises Episode Title:Gideon Rises.Episode Description:After Gideon swindles the Mystery Shack away from Stan, everything in Gravity Falls appears to be even more west of weird – Dipper, Mabel and Grunkle Stan are forced to move in with Soos and his grandmother, while the town remains enamored with Gideon's charm. Meanwhile, Grunkle Stan isn't certain he can take care of the twins, and is considering sending them back home. Thus, the kids get on a bus to leave Gravity Falls; but a giant robot with Gideon inside starts chasing after them because he thinks Dipper has Journal 1. However, the twins defeat Gideon and win back their home. Grunkle Stan exposes him as a fraud, which causes him to go to jail. At the end of the episode, Grunkle Stan has started the activating sequence for the portal in the shack basement after he collected all 3 journals.