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Who were the first major villains introduced in Batman no. 1?
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Batman
Heath Ledger (seated) as the Joker and Christian Bale as Batman in The Dark Knight (2008).
Batman no. 1, which debuted in the spring of 1940, introduced two major villains who became essential figures in the character's history: the Joker and the Catwoman.1
At the time of her initial appearance, the character known as Catwoman was referred to as "the Cat".1