5 Weird Facts From the Gravity Falls Series Finale

Nivea Serrao
Disney XD

GRAVITY FALLS - "Roadside Attraction" - Grunkle Stan takes the kids with him on a road-trip to sabotage all the other tourist traps in Oregon. This episode of "Gravity Falls" will air Monday, September 21 (8:00 PM - 8:30 PM ET/PT), on Disney XD. (Disney XD) DIPPER, GRUNKLE STAN

It's the end of the world as we know it on Disney XD's Gravity Falls as Weirdmageddon continues to rage on.

RELATED: 7 things to know about the Gravity Falls series finale 

But while creator Alex Hirsch remains tight-lipped about what's coming up in the hour-long series finale (Monday, Feb 15 at 7 p.m.), he is willing to share five weird facts about the whole Weirdmageddon arc—including the possibility of a few more crazy celebrity cameos—in this exclusive video:

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Gravity Falls series finale, Monday, February 15th at 7/6c on Disney XD