Dexter: Original Sin drops a bombshell—Is Harry really Deb's biological father?
We’re officially at the halfway mark of Dexter: Original Sin Season 1, and the prequel series has already delivered significant revelations about the characters’ lives before the original Dexter series. From uncovering unknown truths to confirming long-held fan suspicions, the prequel has been nothing short of intriguing.
Harry Morgan’s Heartbreaking Backstory: A Tragedy That Changed Everything
One of the most shocking revelations in the prequel is about Harry Morgan's past. We learn that Harry and his wife Doris had a son, Harry Jr., who tragically drowned while wandering the house unsupervised as Harry was engrossed in a football game. Harry Jr. was around two or three years old—the same age Dexter was when Harry first met him. This tragedy played a pivotal role in Harry's decision to adopt Dexter, effectively replacing the son he lost, while leaving Brian Moser, Dexter’s biological brother, neglected.
Harry and Doris grieved their loss together for years, attempting to have another child while navigating their shared pain. During this time, Harry began working closely with Laura Moser, who served as a confidential informant (CI) for him and his partner, Bobby Watt.
Harry and Laura Moser’s Relationship: A Love That Crossed Boundaries
In the first five episodes of Dexter: Original Sin, we witness the evolution of Harry and Laura Moser’s relationship. While Laura is initially just Harry’s informant, their mutual admiration grows. Dexter and Brian’s presence strengthens their bond further, as Harry demonstrates his protective and paternal instincts toward Dexter.
One major confirmation from the prequel is that Harry was unfaithful to Doris, having an affair with Laura Moser. Although the original series (2006–2013) hinted at Harry’s possible infidelity, it was never explicitly confirmed—until now. Harry and Laura’s deep connection adds an emotional layer to the devastating tragedy that later befalls the Moser family.
Did Dexter: Original Sin Hint at Debra Morgan’s True Parentage?
The latest episode, titled “F is for F*ck Up,” introduced a storyline that has fans buzzing with theories. After Harry confesses to Laura about losing his son, he returns home to Doris, who appears unaware of his affair. She excitedly informs him that they have something to celebrate—she’s pregnant with Debra Morgan.
However, Harry’s reaction to the news raises eyebrows. Upon seeing a toddler toy from Harry Jr. on the table, Doris reveals her pregnancy, calling it a “miracle.” Harry’s hesitant response—“W-We haven’t even been trying”—and his apparent confusion have led fans to speculate that Harry may not be Debra’s biological father.
Doris explains that her friend, Camilla Figg, helped her visit the gynecologist, adding to Harry’s disbelief. While Doris has always been portrayed as a devoted wife, the ambiguity in this scene leaves room for interpretation. Could Doris have cheated on Harry?
Who Could Be Debra Morgan’s Biological Father?
If Doris did have an affair, the question remains: Who is Debra’s real father? Fan theories have pointed to Thomas Matthews, who has been notably absent from Dexter: Original Sin so far. Matthews’ long-standing connection to the Morgan family and his prominence in the original series make him a plausible candidate.
Of course, this theory is purely speculative. Doris has never shown signs of being unfaithful, and the prequel could simply be adding dramatic tension without undermining her character.
What Do You Think?
Did Dexter: Original Sin hint that Harry isn’t Debra Morgan’s biological father, or are fans reading too much into the scene? Share your thoughts by voting in the poll below!