The character of Azrael (Jean Paul Valley) was introduced into the DC Universe in 1992, and almost immediately after his debut in the SWORD OF AZRAEL miniseries, became one of the key figures in the KNIGHTFALL storyline. This raises the question: was Azrael introduced specifically to service the plot of KNIGHTFALL, or was he a character who would have been introduced as a new foil for Batman regardless of whether KNIGHTFALL had been published or not?
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