Co-written by Henry Galley.

In his acclaimed cartoon series Gravity Falls, Alex Hirsch created and voiced one of the most effective and memorable villains in western animation: Bill Cipher. The terrifying triangle cast a spell over viewers for years to come, and his legacy is the show's legacy. This is how that incredible villain met his well-deserved ending at the hands of the Pine Family. This is Bill Cipher's One Fatal Mistake.

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