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From Wikipedia: In Batman (1989), Billy Dee Williams appears as a Harvey Dent before his disfigurement, vowing to reduce crime by locking up mob boss Carl Grissom. Williams was set to reprise the character as Two-Face in the sequels, but the Harvey Dent character was deleted from the script for the sequel Batman Returns (1992), and Batman Forever (1995) ...


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By definition, this can only be an opinion rather than an “official” answer. Riddler and Two-face had just presented Batman with an impossible choice - they had dropped both Dr Chase Meridian and Robin, with the anticipation that Batman would only be able to rescue one of them - he would not be able to “save both” of them. Think of what those two characters ...


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Artistic freedom allows him to do this. Besides, those early superhero worlds were 100% white. It may have been considered tasteless to have a black character play a villain, which could have been construed as racist by all those happy race-baiters. If you're saying Dent appeared in an earlier Batman movie (I don't really recall those Burton ones too well....


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