What happens when a certain Pines Family meets Doctor Emmett Lathrop Brown and Martin Seamus McFly? What happens when a certain Dorito demon returns? Let's just say that... Doc.: "When this baby hits 88 MPH, you're gonna see some serious weirdness." Me: "Hey. How'd you get into the story description? You don't come in untill AFTER the story STARTS." Doc.: "I figured Eh. What the heck? Why not?" Me: *face palms* "Let's just start." (I don't own Gravity Falls or Back To The Future. Universal Studios owns Back To The Future. Alex Hirsch and Disney own Gravity Falls.)