Prologue
Five years after coming to Gravity Falls for the first time Dipper and Mabel are 17 years old. They had come to Gravity Falls only once after that first year, but for only a week when they were 15, just to visit with their parents. They were excited to come back for an entire summer, they wanted to spend it with their friends and Dipper's girlfriend, Pacifica Northwest. At first she was a rude, stuck up, bitch. But then Dipper helped her with a ghost and they bonded. They somehow had a successful long distance relationship, which was amazing. Also Pacifica and Mabel are very good friends after getting to know each other. They had no idea what was in store for them when they got there.
In Gravity Falls, all of Mabel and Dipper's friends were throwing them a party for coming back for the summer. Wendy, who is now 20, was helping with decorations, along with Robbie, and Tambry. Stan and Ford were helping with the surprise aspect, so they were going to pick them up from the airport and hope they don't catch on. Soos was helping with anything he could help with, like fixing things. And everyone else was just excited for them coming back. All except for one person, Gideon Gleeful, he has been planning for this day for 5 years. Ever since he threw him in prison he wanted nothing more than revenge, and revenge is what he was going to get.