Dexter Trinity Killer Spinoff Series Confirmed With Fan-Favorite Star Returning

A Dexter spin-off centered around the Trinity Killer appears to be in the works with a fan-favorite actor returning to the show. Dexter is one of Showtime’s most valuable franchises out there thanks to its ability to not only drum up awards hype, but also cultivate a massive, hungry audience that’s seemingly insatiable. The series has been running in various incarnations for 19 years now and is likely to last much longer than that. Dexter has managed to keep fans captivated thanks to an incredible performance from lead actor Michael C. Hall, exciting storylines and truly menacing villains who terrify viewers with all sorts of heinous acts.

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Probably one of the best seasons of not just Dexterbut television as a whole is fourth season off Dexter. Dexter Morgan now has a child of his own, is married and tries to balance being a serial killer while being a family man. The big bad of the season, the Trinity Killer played by John Lithgow, seems to mirror Dexter in some way, but makes Dexter think he can have it all. He knows he’ll have to put Trinity down at some point, but hopes he can at least learn from him before he wraps him in plastic. Unfortunately, this is a costly mistake for Dexter and he pays the ultimate price.

Lithgow’s take on the Trinity Killer is a remarkable feat, as he’s chilling but also as loving as Dexter on the surface. That’s a highlight Dexter never managed to top that in future seasons, which is why Showtime is interested in returning to that well. It was announced in 2023 that Showtime would develop new Dexter shows, including prequel series Dexter: Original Sin and a continuation of Dexter: New blood. On top of that, they were eyeing a Trinity Killer spin-off, but details were scarce at the time. The project went dark after a while and was believed to be buried at the bottom of the ocean, but that doesn’t seem to be the case anymore. A new one report from Deadline claims that Dexter’s Trinity Killer spin-off is still in the works.

Deadline notes that Dexter showrunner Clyde Phillips and writer Scott Reynolds will serve as co-creators and executive producers on the Trinity Killer series. A writers’ room was formed in the spring, and Phillips told Deadline earlier this month that all the episodes have been written. He noted at the time that the series was on the back burner, but John Lithgow has signed on to come in and narrate the untitled Trinity Killer spin-off. Showtime is expected to wait to see how Dexter: Original Sin do before attempting an additional spin-off, especially one that probably wouldn’t have Dexter at all.

The Dexter spin-off would focus on Arthur Mitchell’s younger life and how he came to be the monster we know. His origin was revealed in Dexter and there are details of all the places he’s been and all the people he’s killed, but there are still some areas to explore if the audience is interested. Sometimes, though, it’s better to just leave villains mysterious. That tends to be what makes them scarier and more formidable. However, Original sin was considered a bad idea by fans and has received a pretty lukewarm response so far.

Original sin also allowed Michael C. Hall’s Dexter to come back to life. The prequel series is framed as Dexter’s life flashing before his eyes after being brought back to life by doctors in the emergency room following the events of New Blood. Michael C. Hall returns as Dexter Morgan in Dexter: Resurrectiona sequel series that will come out in June 2025. Right now, details are very sparse about that project, but the creative forces behind the show hope to keep the sequel series going for multiple seasons, as Michael C. Hall is a big draw for Dexter fans.

Rumors suggest so Dexter: Resurrection will be set in New York City and bring back beloved characters like Harry and Dexter’s son, Harrison. It’s also rumored that Peter Dinklage will play an antagonist in the new series, but it’s unclear if he’ll be another serial killer, a member of law enforcement, or something else entirely. Resurrection begins filming in the first week of January, so we’ll likely hear more very soon.