season 2 episode 15 - brand new september 7 on disney xd.\r<br>\r<br>.\r<br>\r<br>Gravity Falls is back! And this episode was a revealing one.\r<br>\r<br>This is the promo for Gravity Falls season 2 episode 15, The Last Mabelcorn. Look out for analysis tomorrow. Hope you enjoy. Facebook .\r<br>\r<br>In this video I analyse the promo for Gravity Falls season 2 episode 15, The Last Mabelcorn. Hope you enjoy. Facebook - .
