The Legend of the Gobblewonker
S01E02 - Airdate: 2012-06-29
Runtime: 30 min
When Dipper and Mabel hear rumors that a lake monster lives at the bottom of the local lake, they enlist Soos to take them on a boating expedition to prove that it really does exist, instead of going with Stan Pines to go fishing.
Episode details and rating from TVmaze.