Dexter is an Emmy and Golden Globe Award-winning American television drama series that airs on the pay-TV channel, Showtime. In February 2008 reruns began to air on CBS. Set in Miami, the series centers on Dexter Morgan (Michael C. Hall), a serial killer who works for the Miami Metro Police Department as a blood-spatter analyst.
The show is based on characters created by Jeff Lindsay for his series of Dexter novels. It was adapted for television by Emmy Award-winning screenwriter James Manos, Jr., who wrote the pilot episode.
On October 21, 2008, Showtime renewed the series for a fourth and fifth season, each consisting of 12 episodes. Season 4 aired its season finale on December 13, 2009 to a record-breaking audience of 2.6 million viewers, making it the most-watched original series episode ever on Showtime.
The series blends drama and horror as it follows the day-to-day events in the life of Dexter Morgan, a forensic blood spatter analyst for the Miami Metro Police Department who also happens to be a serial killer. He was taught by his adoptive father, Harry, only to kill those "who deserve it"; mainly, other killers who have escaped the legal system or were never suspected in the first place. The series shows him balancing an everyday life with his secret identity, all while keeping up a facade of normality. wiki