After agents Powers and Trigger take Stan into custody, Dipper and Mabel begin to wonder how much they actually know about their Grunkle Stan.

Cornered underneath the Mystery Shack, Stan must finally reveal the secrets of his past and his mysterious portal to Dipper and Mabel.

When Grunkle Stan decides to run for mayor, Dipper and Mabel have their work cut out for them trying to turn their gaffe-prone uncle into the perfect candidate.

A new threat leads Mabel to venture into the enchanted realm of the unicorns. Meanwhile, Dipper learns an unexpected twist about the enigmatic Bill Cipher.

Mabel makes plans for her and Dipper's 13th birthday party; Dipper ventures below the town and discovers its most shocking secret.

Bill has returned to take down the Pines family. But this time he has brought some of his friends with him.

Ford discovers Bill’s true motives and a final confrontation with Bill leads to the Pines family’s ultimate fate and greatest sacrifice.