Jack Napier is an alter-ego associated with the Joker, sometimes used as the character's real name. This is a tribute to the actors Jack Nicholson and Alan Napier. It has been used by several incarnations of the Joker, although usually as an alias and not a secret identity.

The "Jack Napier" identity was created by Sam Hamm and Warren Skaaren for the Tim Burton's film Batman (1989).

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