Dexter is a crime thriller series that aired on Showtime. It revolves around Dexter Morgan, a blood spatter analyst for the Miami Metro Police Department who leads a secret life as a vigilante serial killer. Dexter's unique moral code and his pursuit of justice make for a captivating and morally complex storyline. With its blend of suspense, dark humor, and exploration of the human psyche, Dexter has become a cult favorite among thriller fans.