Grunkle Stan and his brother Stanford have died while on an expedition, 10 years after the summer Mabel and Dipper stayed in Gravity Falls. They return to Gravity Falls for the funeral and stay in their old room in the Mystery Shack, reuniting with old friends. Unfortunately, they're also reunited with Bill Cipher, who comes back after they presumably defeated him. Here, they must defeat him again, leading to one epic showdown.
