District attorney Harvey Dent had his whole life going for him until a mob attack left half his face scarred and his psyche permanently fractured. This traumatic event gave rise to Two-Face, one of Batman's most recognizable and oldest foes. This hero-turned-villain was introduced in Christopher Nolan's Dark Knight trilogy as a major character who would affect the entire storyline.
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The cinematic depiction of both Dent and Two-Face differs significantly from the comic book source material, with several plot details embellished to create a fresher origin story. Fans of the films may not know the full details of the comic book character, but there are enough differences between the two that deserve to be pointed out.