Twin brother and sister Dipper and Mabel Pines are in for an unexpected adventure when they spend the summer helping their great uncle Stan run a tourist trap in the mysterious town of Gravity Falls, Oregon.
Dipper, Mabel, Soos, and Wendy attempt to discover the identity of the author of the journals, while Stan continues to work on operating the mysterious portal beneath the Mystery Shack. Together, the group must stop Bill Cipher, a dream demon who wants to take over the world.