“Dexter: Original Sin” announces cast, with Christian Slater starring as the serial killer's dad

"Shadow and Bone" star Patrick Gibson will play Dexter in the prequel series, and Molly Brown of "Senior Year" will appear as his sister Debra.

A new Dexter adventure is in progress.

On Thursday, Paramount+ with Showtime revealed the cast for the planned 10-part thriller about the titular character's days of training to become a serial killer with a code: he only kills people who deserve it. Actor Patrick Gibson (Netflix's Shadow and Bone) will play the younger version of Michael C. Hall's Dexter Morgan, while Christian Slater will portray his adoptive father, homicide detective Harry Morgan. Molly Brown, from film Senior Year, has been cast as Dexter's younger sister, Debra Morgan.

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Jon Kopaloff/Getty; Ted Ely; Stuart C. Wilson/Getty Christian Slater, Molly Brown, and Patrick Gibson to star in "Dexter: Original Sin" for Showtime

Dexter showrunner and executive producer Clyde Phillips returns. The original series ran for eight seasons, from 2006 to 2013, on Showtime. Along the way, it picked up numerous awards, with four wins out of 24 Emmy nominations. John Lithgow took home a trophy for outstanding guest actor in 2010 for his role as serial killer Arthur Mitchell.

Hall starred in 10 episodes of a sequel series, Dexter: New Blood, which aired on Showtime in 2021 and 2022 to big ratings; in fact, it was the most-watched series in Showtime history.

This newest installment will be set 15 years before the original show began.

According to the official announcement, it follows Dexter "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 enforcements' radar. This is a particular challenge for young Dexter as he begins a forensics internship at the Miami Metro Police Department."

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