(Spoilers in the show gravity falls to whoever hasn't seen the whole show) Twins of gravity falls Dipper and Mabel Pines transport from California to Gravity Falls, Oregon to live with their great uncle Stan pines for the summer. And discover a series of journals that unlock the secrets of that town. Dipper wont stop looking for the author of the journals, until he and Mabel find out its Stans' very own twin brother Ford. When Great uncle ford comes back into reality he has a job for Dipper and Mabel. To help save the universe from Bill cipher who is trying to take over the world and needs a special stone on the top of Mt. Ebott to keep him away from their universe. So Dipper and Mabel need to travel up the Mountain and get the stone. But when climbing the dangerous mountain, the twins fall down a long hole to what they thought was death. But The universe had something else in mind... What will happen when dipper and mabel meet the people of the underground, and what will they do? Will they save the broken souls? Or will they not be strong enough to fight back against the erdge to kill them all? with a little help of course.