Batman: The Killing Joke is a DC Comics one-shot by Alan Moore and Brian Bolland known for its retelling of the Joker's origin, analysis of his psychology, and his shooting and paralysis of Barbara Gordon.
Batman: The Killing Joke (comic)
DC History
for DC History in Marvel vs DC: Secret Crisis
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When two worlds collide, it is the even as old as time. DC Legends face off with Marvel Legends.