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Mobster George “Boss” Dyke is executed in the gas chamber, but has his brain transplanted into the body of a gorilla. The Gorilla Boss of Gotham fights Batman twice. Later, the alien villain Sinestro steals the Boss' cerebellum, expands it to planet-size, and used it as a power source. This unnatural abomination is destroyed by Superman. Somehow, the Boss' brain is returned to his gorilla body and gets used as a pawn by Gorilla Grodd.

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Batman Villain(s)
This character, team or organization, has been primarily an enemy of the Batman, or the Batman Family as a whole. This template will categorize articles that include it into the category "Batman Villains."

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