is the 16th episode of the first season of Gravity Falls , which originally premiered on Disney Channel on April 5, 2013. The episode focuses on the sibling relationship between Dipper and Mabel Pines as they discover a secret room in the Mystery Shack and fight for its ownership, leading to a supernatural body-swap. Plot Summary
is the 16th episode of the first season of Gravity Falls , which originally premiered on Disney Channel on April 5, 2013. The episode focuses on the sibling relationship between Dipper and Mabel Pines as they discover a secret room in the Mystery Shack and fight for its ownership, leading to a supernatural body-swap. Plot Summary