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Grunkle Stan runs for mayor, so Dipper and Mabel try to help their gaffe-prone uncle become the perfect candidate.
A new threat leads Mabel to venture into the enchanted realm of the unicorns. Meanwhile, Dipper learns a surprising 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.
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