Patrick Gibson will play the titular role of Dexter Morgan alongside Christian Slater who will play Harry Morgan, Dexter’s adoptive father and homicide detective. Molly Brown ('Senior Year') will play Dexter’s younger sister, Debra Morgan. 

You may have previously seen Dubliner Patrick Gibson in Netflix's 'The OA' while he most recently starred in TV series 'Shadow and Bone'. Additional past credits include 'Good Girl Jane', and 'Property of the State', the latter of which earned him an Irish Film and Television Award for Rising Star in 2017.

The series titled 'Dexter: Original Sin' will be set in 1991 in Miami, 15 years before the events of the original 'Dexter' TV series. Showrunner Clyde Phillips will return to take the helm in this 10-episode thriller which will "chronicle America’s favorite serial killer... in training."

The original 'Dexter' aired from 2006 to 2013, with a revival season in 2021. The show centred around Dexter Morgan (Michael C. Hall), a forensic blood spatter analyst for the Miami Metro Police Department who leads a secret life as a vigilante serial killer. His unique moral code drives him to target other murderers who have escaped justice.

The show became one of the most acclaimed series on television, earning multiple Emmy and Golden Globe nominations for best television drama series as well as a prestigious Peabody Award in 2008, and was twice named one of AFI’s top 10 television series.

The logline for the show reads: "'Dexter: Original Sin' follows Dexter (Gibson) as he transitions from student to avenging serial killer. When his bloodthirsty urges can’t be ignored any longer, Dexter must learn to channel his inner darkness.

"With the guidance of his father, Harry (Slater), he adopts a Code designed to help him find and kill people who deserve to be eliminated from society without getting on law enforcement’s radar. This is a particular challenge for young Dexter as he begins a forensics internship at the Miami Metro Police Department."

'Dexter: Original Sin' is expected to air on Paramount+ in 2025.