The Illuminati and The Believer (Part 1: The Return)
After the events of Gravity Falls, Bill Cipher lives and plans to rule the world again, but he meets with a new host: a grade 10 high school student. From there, Bill will obey every command from his new host or he will not invade Earth again.
Later on, three high school kids are trying to stop Bill Cipher from his upcoming Weirdmaggedon.
This story was inspired by Gravity Falls and Star Wars