The "Flashpoint Joker" is an alternate version of the Joker. In this reality, Martha Wayne, the mother of Bruce Wayne, becomes the Joker following Bruce's death at the hands of a mugger.
Martha goes insane with grief and terrorizes Gotham City as the Joker, wearing a twisted version of the Bat-symbol on her costume as a mockery of her husband.
The "Flashpoint" storyline depicts a different DC Universe from the main continuity, with alternate versions of familiar characters.
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