Harvey Dent, the future villain Two-Face, has been cast in Fox's Gotham. The character will be played by Nicholas D’Agosto (Masters of Sex).
Dent is the man who becomes an idealistic assistant district attorney for Gotham City, vowing to eradicate the crime and corruption that has poisoned it. He becomes the white knight that the dark city needs. As you know, he eventually turns to the dark side and becomes Two-Face.
This will only be a guest star role on the series for now. The first season is currently focused on the origin of Oswald Cobblepot (Robin Lord Taylor), who later becomes the Penguin. The report says that there is a series regular option for D'Agosto if the show is renewed for a second season, which I'm sure will happen.
I have been enjoying the show immensely so far, and I can only see it getting better from here.