A brief history of the Joker
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Joker( DC Comics )
'A Death in the Family' (1988)
The same year "The Killing Joke" was released, DC Comics featured a four-part storyline in the regular Bat-comics in which the Joker savagely beat Robin and blew him up with a bomb. In a one-time-only gimmick, editors gave out two phone numbers to readers: one for those who wanted to see Robin live, the other for those who wanted to see Robin die.
The killing scarred Batman for years, making the Dark Knight even darker and the Joker even more menacing.