- Season 2eps20 — Gravity Falls

"Weirdmageddon 3: Take Back The Falls" serves as the acclaimed double-length finale of Gravity Falls, featuring the town's ultimate battle against Bill Cipher and a bittersweet resolution for the Pines family. The episode concludes the series with the destruction of Bill through Stan's sacrifice, leading to the twins' departure after their 13th birthday. For a detailed recap, visit TV Tropes . Gravity Falls Finale Review - Eagle Eye