Dexter: Original Sin will likely need to retread ground already covered in the original Dexter show, but there’s one moment in particular that will prove pivotal to the main character’s development. The cast of Dexter: Original Sin will consist of younger actors playing characters who have largely already been established in the parent show. The role of Dexter Morgan will be played by Patrick Gibson, rather than original actor Michael C Hall returning to play the character. However, Hall’s history with the franchise could present the prequel with something of a problem.

No one from the original Dexter cast is expected to reprise their respective roles in any meaningful capacity in Original Sin, although the possibility of flashforwards does remain. Dexter often jumped around in the timeline of its titular character, so Original Sin may have to adhere to certain pieces of established canon from the serial killer’s past. In fact, one massive macabre milestone from Dexter’s younger years has already been covered before the prequel show has even started.

Dexter Season 1 Already Showed Dexter Morgan’s First Kill In A Flashback Sequence

Michael C Hall wore a wig to look younger in Dexter’s flashbacks

Original Sin will invariably want to cover the first time Dexter killed anyone, as implied by the show’s subtitle. However, the moment was already shown in Dexter season 1, episode 3, “Popping Cherry.” The milestone is shown in one of Dexter‘s hallmark flashback scenes, which has Michael C Hall wearing an unconvincing wig to suggest to the audience he is much younger than in the show’s present-day sequences.

Young Dexter kills Denise Crosby’s Nurse Mary, as the nefarious medical worker caring for Dexter’s father is slowly and quietly trying to kill Harry Morgan with a gradual drug overdose. The scenario leads Dexter to infiltrate Mary’s home, shrinkwrap the environment, and end the life of Crosby’s character as part of his own twisted ritual. The moment is messy and imperfect, showcasing the fact that Dexter’s status as a streamlined killer wasn’t due to natural talent.

Dexter: Original Sin Has To Choose Between Recreating Dexter’s First Kill Or Reusing The Flashbacks

The Dexter prequel may just use archive footage of Mary’s murder

Original Sin needs to decide whether the Nurse Mary kill sequence will be included via archive footage or whether it’ll recreate the scene with Patick Gibson in the role of the story’s main character. If the latter option is taken, it risks retconning certain details from Dexter Morgan’s first kill. Or, as the upcoming show has seemingly named it, his, “Original Sin.” On the other hand, it could be that Hall’s character is simply misremembering the first time he took a life in Dexter, and Gibson’s version in Dexter: Original Sin will be the canonical version of events.