Fics like Crossover Action Club

Two years after Weirdmaggedon and one year after The Book of Bill, Dipper and Mabel Pines have grown adjusted to the world of Gravity Falls. Weirdness, mysteries, and oddities lie just within sight in this home away from home. However, when a mysterious flyer lands on the Pines' front Doorstep, things quickly take a turn for the worse. Old wounds, new mysteries, and potentially an even bigger threat than Bill Cipher himself arise, launching the family into a whole new universe of adventure. But an even scarier proposition awaits the Pines: the idea that this entire event could be... nothing at all. Now with a TVTropes page! (Note for newcomers and returning readers: This fic is NOT ABANDONED. I had aimed to release at least one chapter every month, but goddamn, college is a time-management battleground. Once I can establish a stable work schedule, chapters will come much sooner. Thank you to all 400 of you for reading.)

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