Weirdmageddon 3: Take Back the Falls

"Weirdmageddon 3: Take Back the Falls" is the series finale of the American animated television series Gravity Falls, which was created by Alex Hirsch. The episode, which serves as the twentieth episode of the second season and the 40th episode overall, was written by Shion Takeuchi, Mark Rizzo, Josh Weinstein, Jeff Rowe, and Hirsch, and directed by Stephen Sandoval. The series follows twelve-year-old twins Dipper (voiced by Jason Ritter) and Mabel Pines (voiced by Kristen Schaal), who stay for the summer with their great uncle Grunkle Stan (voiced by Hirsch) in a tourist trap called the Mystery Shack, set within the fictional town of Gravity Falls, Oregon. In this episode, Stan's brother Ford (voiced by J. K. Simmons) discovers the extent of Bill Cipher's plans, while the Mystery Shack crew forms a plan to fight back and reclaim the town. A final confrontation with Bill leads to the Pines family's ultimate fate and greatest sacrifice.

"Weirdmageddon 3: Take Back the Falls" was first broadcast on February 15, 2016, on Disney XD, and was watched by 2.47 million household viewers in the United States and garnered a 0.51 rating in the 18-49 demographics. It became the most watched telecast in the history of Disney XD, beating "A Tale of Two Stans", another episode of Gravity Falls. It was followed by the 2018 graphic novel Gravity Falls: Lost Legends and the 2024 novel The Book of Bill, both partially set after the events of "Weirdmageddon 3: Take Back the Falls".