After a small deal with Bill, Dipper is taken away for 6 years of his life. After some time the rest of the gang all accepts to accept the fact that Dipper is gone. But when news arrives the Dipper is back, they take the long journey back to Gravity Falls only to see that the Dipper they wanted was the one they didn't...
THE NEW DREAM DEMON THE MOST POWERFUL DEMON THE ONLY DEMON KILLED BY A SHADOW THE EVIL WITHIN RELEASES AND NOW A NIGHTMARE IS BORN AND THAT NIGHTMARE IS DIPPER PINES A.K.A. BRUTALSHOUT
What if in weirdmaggedon Bill after turning Ford into gold, and Dipper standing up to him. He feels something radiating on the young Pinetree.