Dexterstar John Lithgow has offered his advice for the next actor to follow in his footsteps for the upcoming Trinity Killer prequel series. Serving as one of the original show’s most memorable villains, Lithgow’s season 4 antagonist is set to receive his own spinoff show in addition to the forthcomingDexter: Resurrectionsequel series, and the recently releasedDexter: Original Sinprequel. In December 2024, it was also reported that Lithgow could potentially be returning to narrate the series in much the same way as Michael C. Hall lent his voice to the franchise’s current prequel show.
Speaking withScreen Rantat this year’s Sundance Film Festival forJimpa,Lithgow was careful about confirming whether he would be narrating the Trinity Killer prequel seriesas reported. However,he does offer one succinct piece of adviceto the actor selected to play his character’s younger self, namely to“just be on his side.”Lithgow also admits it would not be an easy task to achieve. Check out his comments below:

Just be on his side. [Laughs] Not an easy thing to do, with the Trinity Killer, but be on his side.
What Lithgow’s Comments Mean For The Trinity Killer Prequel
The Trinity Killer Remains One Of Dexter’s Best Adversaries
Despite originally ending withDexter’scontroversial season 8 finale, recent years have proven there is still plenty of life left in the hit serial killer drama. Not only does 2021’sDexter: New Bloodand the forthcomingDexter: Resurrectionoffer viewers a chance to continue following Hall’s fan-favorite character moving forward, but the franchise has already begun fleshing out the events that led to some of the original show’s biggest moments.
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WithDexter: Original Sinbecoming Showtime’s most streamed premiere on record, all eyes will be on the new Trinity Killer show to see whether it can keep the momentum going. However, with Lithgow’s Arthur Mitchell widely considered one ofDexter’smost engaging antagonists, whichever actor is chosen to play a younger version of the character will have a tough time proving himself worthy of the role. Much as Lithgow suggests, this will not be an easy task to achieve, buttreating him as more than a one-dimensional villain will be keyto creating a worthy prequel.

Our Take On Introducing Viewers To A Young Trinity Killer
The New Prequel Could Be A Distorted Reflection Of Original Sin
Hall’s Dexter Morgan, and by extension, the younger version portrayed by Patrick Gibson, is such an intriguing character precisely because of the constant conflict between his need to conform to his strict code of ethics and his darker impulses. Yet, by comparison,Lithgow’s Arthur Mitchellis in many waysa dark reflection of what Dexter could have beenwithout his foster father’s involvement and the code that was instilled in him from a young age.
With this in mind, the upcoming Trinity Killer prequel series could potentially provide a direct counterpoint toDexter: Original Sin, and provide viewers with a distorted reflection of Dexter’s own journey toward becoming a serial killer. While audiences already have some idea of the events that led Arthur Mitchell to become the murderer they first met inDexterseason 4, the actor chosen to follow in Lithgow’s footsteps will have a unique opportunity to not only expand the character’s lore but also to cast his homicidal impulses in a whole new light.

Dexter
Cast
Dexter is a television series following Dexter Morgan, a blood spatter analyst for Miami Metro Police who secretly leads a dual life as a vigilante serial killer. Released in 2006, the show focuses on Dexter’s internal conflict as he hunts down criminals who elude justice within the legal system.