Gravity Falls Episode 1 Tourist Trapped Episode Title:Tourist Trapped.Episode Description:Two fraternal twins, Dipper and Mabel Pines, arrive at the remote town of Gravity Falls to spend their summer break with their great uncle Stan, but a mysterious journal hidden in the forest found by Dipper reveals the town's strange and uncanny secrets to the duo, and Dipper tries to save Mabel from her strange new boyfriend who appears to be a zombie, but is actually something much stranger.