When Mabel discovers that her favorite boy band is actually a bunch of imprisoned clones, she sets them free, only to decide on keeping them for herself. Meanwhile, Dipper is convinced that Robbie plans to brainwash Wendy with a secret message hidden inside one of his songs.

Dipper, Mabel, and Soos must travel through Grunkle Stan's mind to defeat a tricky dream demon summoned by Lil Gideon.

Li'l Gideon swindles the Mystery Shack away, forcing Grunkle Stan and the kids to move in with Soos. While Stan weighs how he can still care for his grandniece and nephew, they decide to take on Gideon.

The Pines family is starting to get everything back to normal after the Lil' Gideon incident. They throw a “Mystery Shack Is Back” party, but some unwelcome guests intend to crash it.

Dipper’s secret journal pages lead him and the gang to the author’s hidden bunker where they find themselves face-to-face with a mysterious figure from Gravity Falls’ lore.

In three separate mysterious tales, Stan is cursed by a Witch, Waddles accidentally eats a bowl of brain-enhancing jelly and builds a machine that allows him to speak, and Mabel faces her fear of claymation.

The kids, along with Old Man McGucket's help, discover there is a secret society in Gravity Falls.

Cornered underneath the Mystery Shack, Stan must finally reveal the secrets of his past and his mysterious portal to Dipper and Mabel.

Dipper finds an unlikely friend to join him with his newest obsession, a board game called “Dungeons, Dungeons & More Dungeons.”

Mabel makes plans for her and Dipper's 13th birthday party; Dipper ventures below the town and discovers its most shocking secret.