During Mabel and Dipper's second summer at Gravity Falls, their Grunkle Stan decides to start a summer camp. Coraline and her cousin, Norman are forced to go to this camp by their parents, agreeing only if they get to bring their friends Wybie and Neil. Meanwhile, Psychonauts, Raz and Lili are going to Gravity Falls to find the paranormal activity and go undercover at Stan's camp. What could go wrong?