As two of DC Comics’ greatest criminals, the Joker and Lex Luthor have worked together on more than one occasion, but the World’s Foulest very nearly killed each other over an entire planet of supervillains. The Joker is known for his seemingly erratic personality while Luthor is the ultimate cold and calculating mastermind. And when these two planet-sized egos were forced to depend upon each other for survival, things definitely could have gone better.
As the respective archenemies of the
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