Joker decides that its time to become a “crime fighting vigilante” instead of a notorious villain. So he put on a Batman costume and started punishing those who, according to his definition, were “criminals”. But that’s not all; Joker decides that Gotham should have his evil counterpart (i.e. the Joker) and since he is now “the Batman”, then Batman needs to be the Joker. So Joker injects the Joker venom in Bruce’s veins to make him his evil counter part. Now the real Batman has to take down the Joker to get his venom so that anti-venom can be created.
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