In the final confrontation between Bill and the remaining townspeople, the Pines family must make a great sacrifice or be defeated by this otherworldly invader.
As Bill and his friends attempt to expand their realm of weirdness, Dipper and the gang run into some unexpected problems while trying to rescue the imprisoned Mabel.
While Mabel is busy planning her and Dipper's upcoming 13th birthday party, Dipper and Ford venture under the town where they discover its most shocking secret yet.
Grunkle Stan takes the kids on a road trip to sabotage all the other tourist traps in Oregon.
Ford gives Dipper some information about Bill. Meanwhile, Mable and the girls set out to find a unicorn so that they can use its hair to protect the Mystery Shack from Bill.
Rival paleontologists Othniel Marsh and Edward Cope clash. The Big Bang's echo is discovered by Penzias & Wilson.
Frederick and Celery's wedding is about to start and Chair becomes the lady of Bellacourt Manor.
Grunkle Stan runs for mayor, so Dipper and Mabel try to help their gaffe-prone uncle become the perfect candidate.
Lillian's invited to a party on the beach by her new friends; Beatrice meets Thomas Edison; Blanche receives a strange letter from the Triangle Shirtwaist Factory; Garfield tries to hold the family together.moreless
Beatrice gets very upset when Frederick gets engaged, and Dodo has a rough time going through drug withdrawal.
Dipper receives his favorite board game in the mail and gets his great uncle to play with him. Unfortunately, the game's wizard materializes in Gravity Falls and they must find a way to defeat him.moreless
An old flame of Lillian's arrives on her birthday, a serious illness affects Mr. Peepers and Hortense has a surprising discovery.
Hortense falls for a chef who accompanies the Commodore on his return to Bellacourt Manor. Meanwhile, Frederick is subjected to a psychological evaluation to determine if he's fit for a Senate run; and Hamish tries to blackmail Chair.moreless
Chair receives a lesson in the art of servitude from Peepers. Meanwhile, Lillian and Beatrice get ready for Newport's Most Beautiful Pageant, but Hortense sets out to sabotage the event.
Grunkle Stan is forced to reveal his history with his twin brother to Dipper and Mabel.
Lillian and Beatrice stage mock funerals for their husbands; Peepers learns of his father's death from his estranged family, forcing him confront his Native American roots.
Lillian wants a divorce when she hears that they're all the rage; Frederick and Garfield are smitten with a charming visitor.
In the premiere of this comedy about an aristocratic family in Newport, R.I., in the early 20th century, Bellacourt Manor welcomes a new servant; a space opens up in the Newport 400; and the family receive a visit from Helen Keller.moreless
After government agents take him into custody, the twins uncover some things that cause them to question how much they know about their Grunkle Stan.
Dipper tries to rid the Northwest Mansion of a ghost before it wreaks havoc on Pacifica's upcoming party.
Mabel takes matchmaking too far when she steals a love potion from a real love god.
Mabel and Dipper's attempts to celebrate Soos' birthday get interrupted by the time traveling Blendin's quest for revenge.
The kids discover there is a secret society in Gravity Falls.
While Finch, Sam, and Root try to protect a pollster who suspects that Samaritan rigged the elections, Reese is sidelined in therapy due to his high number of shootings during homicide cases.
This episode consists of Stan telling three different stories. The first one, Hands Off, is about Stan getting cursed by a witch.Abaconings, is about Dipper's attempt to get smarter and the last one, Clay Day, deals with Mabel's fear of stop motion animation.moreless
Soos needs a date for his cousin's engagement party, so he uses a dating simulator game to help him to be able to talk to girls.
Mabel puts on a sock puppet rock opera to impress a local puppeteer, but the show doesn't go quite as planned.
Mabel challenges Pacifica to a miniature golf contest.
Dipper's secret journal pages lead him and the gang to the author's hidden bunker.
The CIA showing up during the Mystery Shack's re-opening leaves Stan feeling threatened; that is until he's faced with an even greater threat: zombies!