Part one of a two parter. Harvey Dent is hoping to get re-elected and marry his fiance, but he is suffering from multiple personality disorder. There are several moments where his 'Big Bad Harv' persona breaks out and starts attacking people. When he goes after Rupert Thorne, half his face ends up being scarred.
This was an absolutely brilliant episode. The themes of duality and two people residing in one body are used here to great effect, as one moment, Harvey is cool and collected, then he becomes a vicious, angry shell of his former self just because he gets mud on his face.
There were some classic moments here. Harvey's therapy was well-done, especially when the psychiatrist asked to talk to his dark side. Another great moment was when Rupert Thorne was trying to psyche Harvey out.
A brilliant episode that leaves you wanting to watch Pt 2.