The sinister underbelly of Pandemonium has always been legendary for its vicious inhabitants. But a recent development has left even the seasoned sinners trembling. A mysterious force, some say as "Hellish Gravity," has taken hold of the city, causing objects and people alike to drift in bizarre ways. Is this a prank by one of Lucifer's angels? A m

Dipper and Mabel Pines are totally clueless/completely unaware/blissfully ignorant of the terrifying truth/sinister secret/dark fate that awaits them. Their summer vacation to Gravity Falls has taken a horrifying/demonic/unholy turn, as they find themselves trapped in a scorching/blazing/infernal hellish dimension. The Mystery Shack is now a haunte