An incredible new discovery turns their world upside down. Question everything on an all new Gravity Falls premiering Monday, October 12th, at 8:00 PM, only .\rbr\rbrSeason 2 episode 17 - Brand new Monday october 12 at 8p on Disney XD.\rbr\rbrBreak down the house with a fresh Gravity Falls premiere!\rbr\rbrHeres an episode clip for the new episode of Gravity Falls Dipper and Mabel vs. The Future ! Heres a hashtag for this new episode: .\rbr\rbrHeres an episode clip for the new episode of Gravity Falls Dipper and Mabel vs. The Future ! Heres a hashtag for this new episode: .