Batman Begins
When Jim Gordon reveals to Batman that a new criminal has surfaced in the closing scenes of this movie, the Jokers calling card is shown, making it clear that he would appear in the sequel. But a closer look shows that the playing card was signed into evidence by someone called J Kerr. Short for Joe Kerr an alias the villain has adopted over the years, which means he might have been tempting Batman to bring him down for much longer.
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