When Dipper and Mabel hear rumors of a sea monster that lives at the bottom of the local lake, they enlist Soos to take them on a boating expedition to prove it really does exist.

When someone tampers with Mabel's life-size wax statue of Grunkle Stan, she and Dipper set out to find the culprit. Meanwhile, Grunkle Stan mourns over the loss of his wax doppelganger.

Dipper is invited by Wendy and her teen friends on a trek that leads to an abandoned convenience store that may be haunted.

In a quest to attain manliness, Dipper ventures into the forest to battle the notorious Multi-Bear. Meanwhile, Mabel tries to teach Grunkle Stan how to be attractive to women, particularly the waitress in the local diner, Lazy Susan.