Weirdmageddon (event)

Weirdmageddon, also known as the Oddpocalypse, is an apocalyptic event that occurs in Gravity Falls, Oregon that serves as the final story arc of season 2 including the series finale. The event was one billion years prophesied that comes to pass due to the interdimensional rift being cracked, which opened up a unstable rip between Bill Cipher's decaying dimension and Gravity Falls.