Everyone's favorite vigilante serial killer returns with a vengeance in season two of the hit Showtime series Dexter. In this season, Dexter (Michael C. Hall) begins to experience the sting of self-doubt while contending with a particularly dark chapter from his distant past. Meanwhile, the FBI launches an investigation into a series of murders committed by the "Bay Harbor Butcher", causing Dexter to take serious pause in order to protect his dark secret.