You know, I once had an idea where a AU of gravity falls, a atomic apocalypse happend and Mabel and Ford managed to get to the underground bunker safely while Dipper (and everyone else) didn't made it and died or mutated,



With Dipper gone, Mabel went inside the Cyro pods hoping it would kill her, when Ford found out he did the same.



200 years later they was released and Mabel had amnesia, Ford decided to raised her in this new surroundings that is now the wastelands,



also Mabel has a pet mutated pig named Porkmeat



well I managed to give out AU idea to something...