Board Thread:General Discussion/@comment-26408630-20150313212317/@comment-24212799-20150314153800

OnlyOnTuesdays88 wrote: Paulred7 wrote: If he were evil, then why would he be fighting other evil forces, like Bill and the shape-shifter?

Bill took advantage of him and the author essentially tortured the shapeshifter. Mcgucket assisted the author. He said he regretted a lot of horrible things he did and since he worked with him, he probably knew what the portal does, to which he was frightened and hurried to leave the town for some reason.

Also, Alex Hirsch said in an interview about season 2's cliffhanger (and I quote):"....It’s exciting to finally reveal this big answer, but even more exciting to me are the new mysteries that this will begin to illuminate. Stan sacrificed so much to bring his brother back, but who  is Stan’s brother? Why was McGucket so worried? How are the children’s destinies tied up in all this? What is Bill Cipher really after—and who is the  true villain in Gravity Falls? 

http://www.avclub.com/article/gravity-falls-alex-hirsch-his-shows-big-cliffhange-216411