Tonight, another possible serial killer gets outed by Dexter.

debra morgan

Jennifer Carpenter as Debra Morgan in Dexter (Season 8, episode 4) – Photo: Randy Tepper/Showtime

The Dexter episode “Scar Tissue” airs tonight, Sunday July 21, 2013 at 9:00 PM ET/PT on Showtime.

Dexter Scar Tissue Episode Synopsis: – Dexter tracks down another potential serial killer from Dr. Vogel’s list. Quinn celebrates his passing of the Sergeant’s exam by defending Debra’s honor in a fight. Dr. Vogel begins treating Debra for her PTSD.

Meanwhile, what’s going on with the brain surgeon?

And will Quinn’s latest relationship last?

Dexter Season 8 Episode 4

Photos: Randy Tepper for Showtime.

Don’t miss this episode on Showtime, tonight.

CONNECT, you’ll never miss what Dexter’s up to!

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