Why was Bizarro considered an opposite version of Superman?

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Heath Ledger as the Joker sits at an interrogation table with Christian Bale as Batman standing behind him in a scene from the film The Dark Knight. — Supervillain Heath Ledger (seated) as the Joker and Christian Bale as Batman in *The Dark Knight* (2008).

Bizarro is considered an opposite version of Superman because he is a grotesque duplicate of the hero. Within the context of the Superman comic-book series, he is defined by his unconventional nature and inhabits a "Bizarro world," serving as a distorted reflection of the Man of Steel's characteristics and environment.1