Dexter: Original Sin Unveils Shocking Season 6 Deb Twist Nearly Occurred Two Decades Ago

CAUTION! This article contains major SPOILERS for Dexter: Original Sin season 1, episode 5!

The latest episode of Dexter: Original Sin dives deep into the complex sibling connection between Dexter Morgan and Debra Morgan. The prequel sheds light on a pivotal moment that could have altered the course of events in the main series entirely. From the outset of the original show, it is clear that Deb is the singular person in Dexter’s life that he loves unconditionally, and she reciprocates those feelings. Their relationship transcends typical sibling dynamics; they are each other’s sole family and coworkers at Miami Metro, forming a bond characterized by deep friendship. However, in the timeline of Dexter: Original Sin season 1, this intimate connection is still developing.

A Near Confession: Dexter’s Secret Unraveled 20 Years Early

The High-Stakes Conversation Between Dexter and Teenage Deb

During a pivotal interaction, Dexter confesses to Deb that he feels like a terrible person. In a seemingly playful exchange, she retorts, “It’s not like [you] killed someone.” To this, Dexter provocatively asks, “What if I did kill someone?” Deb dismisses his comment, assuming it’s just the effect of being high, but this moment signifies how close the young Dexter came to revealing his identity as a serial killer—a revelation he ultimately kept hidden for two more decades.

In the broader context of the original series, Deb did not learn the truth about Dexter’s dark secret until the season 6 finale, when she unexpectedly discovered him in the act of murdering the Doomsday Killer. Had the truth been unveiled in this early moment, it could have irrevocably changed their fates.

Deb’s Heartbreaking Discovery in the Original Series

The Painful Revelation of Dexter’s True Nature

Dexter holding a match with Deb looking at him

One of the most poignant moments across the eight-season run of Dexter occurs when Deb finally confronts Dexter about his serial killer identity. The realization that her brother has taken over a hundred lives devastates her, as does the knowledge that both her father and her brother had concealed this monstrous truth from her. The betrayal cuts even deeper knowing that the lies were initially intended to protect her.

Dexter’s confession about his secret life as a killer happens in the season 7 episode titled “Sunshine and Frosty Swirl.”Had Dexter chosen to disclose his truth earlier, the siblings might have navigated their complicated realities together. Alternatively, had Deb found out during her teenage years in Dexter: Original Sin, she might have distanced herself from him, potentially changing the trajectory of her life and, perhaps, preventing her tragic fate in the original series’ finale. While she would carry the burden of knowing about Dexter’s crimes sooner, she would also have avoided feeling that two decades of her life were centered around deception.

New episodes of Dexter: Original Sin drop every Friday on Paramount+ with Showtime.

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