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Born in Brooklyn, Napier would come to live in Gotham. In his school years, Jack Napier proved himself to be emotionally unstable, but highly intelligent, showing aptitude in art, science, and chemistry. He also turned to a life of violent crime. When he was fifteen, Jack was convicted of assault with a deadly weapon.
Batman Forever (1995)
He is represented as a hallucination in Batman's mind thanks to the Scarecrow's fear gas.
Batman & Superman: World's Finest (2000)
He is cloned by Lex Luthor.
Batman Beyond (2019)He teams up with Blight after possesing Alex Wayne's body as a ghost.
Batman Beyond 3 (2025)
His ghost becomes a virus under the control of Blight's son.