Original Sin continues to expand on Dexter's lore and how he became a serial killer. Dexter's universe is gradually expanding with many spin-offs, with Dexter: Resurrection on the way. In addition, a spin-off revolving around the Trinity Killer's origin story is also in the works.

Original Sin ends with Deb (Molly Brown) deciding to forego a college volleyball scholarship to follow in her father and brother’s footsteps at Miami Metro, setting up the intricate web of lies Dexter must weave to keep his cop sister off his blood-soaked trail.

Dexter: Original Sin episode 9 has filled fans in on the tragic, secret origin story for Brian Moser AKA the Ice Truck Killer.