An Alternate Solution

Dipper's Grunkle is many things, (old, greedy, a con-man) but trustworthy is not one of them. So imagine his shock when his own twin sister picks Stan over himself! And if that betrayal isn't bad enough, something goes wrong when the portal activates, and Dipper finds himself alone in the vast multiverse. On his own, he now has to avoid Bill and his persistent deals and survive until he can find a way home. Although...does he really WANT to return home to his traitorous sister?