Jimmy Smits and Michael C. Hall

Cheers to Jimmy Smits for turning up the heat on Dexter. In his best role since NYPD Blue'sBobby Simone, the Emmy-winner smolders as Miguel Prado, an ambitious Miami DA who befriends Michael C. Hall's titular blood-spatter expert, unaware the heretofore "ethical" serial killer accidentally offed Miguel's possibly not-guilty brother, Oscar.

It was nerve-wracking enough when Dex had his sister's old bloodhound of a boyfriend (Keith Carradine) on his trail last season. Now Miguel alone knows our quasi-hero also killed Freebo, the sleaze everybody else in the Miami PD believes murdered Oscar — and that's only brought him closer to Dexter.

As plot twists go, this one's a real killer.

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