Weirdmaggedon: The Second Coming? (Volume I)

When Dipper Pines begins to see visions foreseeing a second apocaliptic future caused by a certain demon faced in the past, he must return to the place where he spent the summer before his 13th birthday, Gravity Falls. There he must try to stop his archnemesis from returning to the 3rd dimension, while at the same time investigating several murders related to his mission.