Invited by their father's old friend from another fictional universe, the half-brothers, and the supernatural hunters travel to Gravity Falls, Oregon to celebrate Summerween with the family of Pines including the twin brothers Stanley and Standford. To experience the Summerween holiday, the half-brothers must spend time with the twin brothers, nephew, and niece Dipper and Mabel who have returned to Mystery Shack for Summer 11 years later but also brought a group of Nicktoons characters known as the Nicktoons Unites along with a young Filipino girl named Darlene Paguio shows up and spends time together in one big happy family.
5 parts