"Weirdmageddon 3: Take Back The Falls" is the 20th episode of the second season of Gravity Falls and the fortieth episode overall. It is set to premiere in 2016 and will also be the third and final episode in the Weirdmageddon story arc as well as the one-hour long series finale.
↑ 2.02.1Hirsch, Alex. Goodbye Gravity Falls (Tumblr post). Archived from the original on November 21, 2015. Retrieved on November 21, 2015. “There are two more episodes left: 'Weirdmageddon II: Escape from Reality' and 'Weirdmageddon III' which will be our hour long series finale.”