Set fifteen years before the events of the original series, Dexter: Original Sin pulls back the curtain on the formative years of America's favorite serial killer. The show follows a young Dexter Morgan as he navigates the treacherous waters of high school in 1991 Miami, struggling to control his increasingly powerful and dark urges. Adopted by the tough-but-loving police officer Harry Morgan, Dexter is taught a strict code: only kill those who truly deserve it, and never get caught. As he begins his internship at the Miami Metro Police Department, Dexter is drawn into the orbit of a charismatic new student whose own violent predilections threaten to expose them both. The series stars Patrick Gibson as the young Dexter, Christian Slater as his adoptive father Harry, and Molly Brown as Debra Morgan, offering a chilling and stylish prequel that explores the birth of a monster and the fragile moral framework that attempts to contain him.