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12 Episodes 2013 - 2013
Episode 1
Sun, Jun 30, 201353 mins
It's been 6 months since LaGuerta's murder - and Dexter is still managing life as a dad, brother, and serial killer. Debra now works as a PI for a private firm and Batista has replaced her as Lieutenant. Meanwhile, Miami Metro investigates the murder of a man who has had pieces of his brain removed.

Episode 2
Sun, Jul 7, 201357 mins
Vogel reveals to Dexter that she helped Harry create his Code, harboring a perverse interest and admiration for psychopaths. She asks Dexter to track down the Brain Surgeon, whom she believes to be one of her former patients and a grave hazard to her life. While tracking down the stolen jewels, Debra is beaten by El Sapo, but later murders him; Dexter finds traces of her blood at the crime scene, but hides it from the police. Quinn and Jamie argue over Quinn's future and Batista's involvement in their relationship. Dexter tracks down one of Vogel's patients, Lyle Sussman, who he believes is the Brain Surgeon, but discovers he has been murdered. Vogel and Dexter find a DVD from the Brain Surgeon, showing the killer forcing Sussman at gunpoint to do his bidding. Dexter agrees to track down the killer from Vogel's list of suspects.

Episode 3
Sun, Jul 14, 201349 mins
With Sussman's body arranged to look like a suicide, Miami Metro closes the Brain Surgeon case; however, the real Brain Surgeon leaves disturbing trophies on Vogel's doorstep. Dexter pursues another of Vogel's former patients, Ron Galuzzo. Debra spirals out of control, and despite Dexter's attempts to reconcile their relationship, tries to confess to killing LaGuerta. Dexter arrives and stops her, leaving her with Vogel for psychiatric treatment. Quinn's preoccupation with Debra causes friction between himself and Jamie, and Batista begins to lose faith in Quinn's ability to pass the sergeant's exam. Vogel admits that she finds Dexter's love for Debra unusual and questions why Dexter didn't kill her when she discovered his secret, implying that he is not a typical psychopath. Dexter learns that Galuzzo is a cannibal and kills him.

Episode 4
Sun, Jul 21, 201350 mins
Dexter searches for the next potential killer on Vogel's list, A.J. Yates. He finds evidence that Yates is the Brain Surgeon and tries to kill him, but Yates escapes. Dexter finds out that Vogel is keeping notes on her interaction with him. Miami Metro investigates the murder of one Norma Rivera. Quinn passes the sergeant exam, and Batista presses him to solve the Rivera case if he wants the promotion. Masuka has an awkward encounter with Niki, a 20-year-old, who claims to be his biological daughter via artificial insemination. Vogel begins Debra's treatment, taking her to the shipping container where she killed LaGuerta. Dexter meets his new neighbor, Cassie, who is attracted to mysterious men. Upon learning that Harry committed suicide because of Dexter, Debra tries to kill them both, driving off the road into a lake, then pulling Dexter out.

Episode 5
Sun, Jul 28, 201348 mins
Dr. Vogel is captured by the Brain Surgeon, and Dexter and Debra try to rescue her.

Episode 6
Sun, Aug 4, 201355 mins
Dexter investigates Zach and confirms that he murdered Norma. Vogel wants to teach Harry's Code to Zach, but Dexter is skeptical. Deb helps her boss, Elway, prove his sister's boyfriend is being unfaithful. After being denied the sergeant's position, Quinn zealously investigates Zach. Dexter captures Zach, who only killed Norma to protect his mother's fragile mental state from his father's marital indiscretions; Zach's noble motives convince Dexter to teach Zach Harry's Code. Later, while eating dinner at Deb's, Debra and Dexter are drugged by Hannah McKay.

Episode 7
Sun, Aug 11, 201353 mins
Waking up unharmed, Dexter and Debra believe that Hannah has sent them a message. Dexter finds Hannah's current alias and address, and learns that she is married to multimillionaire Miles Castner. Masuka learns that Niki works at a topless sports bar, so he secures her a part-time job in his lab. Zach visits the precinct with his lawyer and demands that Quinn stop following him. Quinn and Jamie decide to move in together. Hannah confesses to Dexter that she hoped he would kill Miles. Debra borrows Elway's GPS and tracks Dexter. Miles violently confronts Hannah about her meeting with Dexter, and she kills him herself. Dexter and Hannah dump the body, but Debra sees them together. Dexter is called to a crime scene in his building: Cassie has been bludgeoned, in the same fashion as Norma, and Dexter suspects Zach.

Episode 8
Sun, Aug 18, 201352 mins
Dexter receives instructions to attend the latest murder scene that just happens to be in his apartment building. Upon arrival he sees that the victim is Cassie Jollenston, his pretty next-door neighbor and good friend of his nanny Jamie Batista, Lieutenant Angel Batista's sister. When examining the body, he notes that the cause of death was bludgeoning in a fashion similar to Norma Rivera's demise which he already knew to be the work of Zack Hamilton. Additionally, he finds and takes a sample of blood from under one of Cassie's fingernails. Jamie convinces her lover, Detective Joey Quinn, to stay with her because she is frightened, thus delaying him from going on a hunt for Zack who he also suspects. Dexter again meets with Hannah McKay at the marina and agrees to acquire documents and credit cards to facilitate her escape from the country. In the meantime, Debra Morgan is on the hunt for Hannah, determined to halt her interference once and for all. Niki Walters has started to work in the police lab for her pseudo-father Vince Masuka. Dex later determines that it is, in fact, Zack's blood found on Cassie. He approaches Doctor Evelyn Vogel with this information and states emphatically that, this being the murder of a second innocent woman, Zack, who has disappeared, is not adapting to the 'code' and therefor must be eliminated.

Episode 9
Sun, Aug 25, 201355 mins
Investigating Zach's murder, Dexter finds DNA evidence and learns that the Brain Surgeon is Vogel's psychopathic son, who faked his own death years ago and changed his identity to that of a dead man, Oliver Saxon. U.S. Marshal Max Clayton (Kenny Johnson) arrives in Miami to search for Hannah, but Dexter throws him off the trail and moves Hannah to Deb's house. Deb suspects Saxon of Cassie's murder, but he goes into hiding. Debra later considers rejoining Miami Metro. Dexter lures Saxon from hiding but loses him, after which Vogel implores Dexter to let this case go. Dexter makes plans to leave Miami permanently, taking Hannah and Harrison with him, but not before finding and killing Saxon. Unbeknownst to Dexter, Saxon has reunited with Vogel, who accepts him into her home.

Episode 10
Sun, Sep 8, 201353 mins
Saxon asks Vogel to rehabilitate him as she helped Dexter. Dexter gives Batista his notice and tells Debra he's moving to Argentina with Hannah and Harrison. Clayton becomes suspicious that Dexter is leaving Miami to be with Hannah. Debra returns to Miami Metro and rekindles her relationship with Quinn, who has broken up with Jamie. Despite her desire to help Saxon, Vogel decides to betray him after watching the video of Zach's murder. After a treadmill accident, Hannah takes Harrison to the ER, but a nurse recognizes her and puts Clayton on her trail. Vogel brings Saxon to her home, but her nervousness makes him suspicious. When Dexter arrives, Saxon murders Vogel and escapes.

Episode 11
Sun, Sep 15, 201352 mins
Dexter removes all of the evidence pointing to his relationship with Vogel before calling the police. Elway and Clayton suspect that Debra is harboring Hannah. Saxon offers Dexter a deal that the two will leave each other alone; Dexter agrees, but secretly plans to kill him before leaving. With a hurricane approaching Miami, Hannah goes to the airport to wait for Dexter, but she is followed by Elway. Meanwhile, Dexter captures Saxon, but realizes that he no longer has murderous urges in response to his relationship with Hannah. Instead of killing Saxon, Dexter calls Debra to arrest him, but Clayton tails Debra and unknowingly interferes. Saxon kills Clayton and escapes after shooting Debra.

Episode 12
Sun, Sep 22, 201356 mins
Debra is rushed to the hospital and Quinn goes with her. At the airport, Dexter, Hannah and Harrison manage to elude Elway, but they are forced to leave the airport due to the fake bomb scare that Dexter has rigged. Hannah and Harrison board a bus to the Jacksonville airport, but Elway is waiting for them. Hannah evades Elway and escapes with Harrison. Saxon goes to the hospital with the intention of killing Debra, but Dexter spots him and he is arrested by Angel. After successful surgery, Debra suffers a massive stroke from a blood clot, leaving her brain dead. Later, Dexter meets Saxon in his cell and provokes him to stab him with a pen. Dexter retaliates and kills him by puncturing his carotid artery with the pen. Angel and Quinn question Dexter about Saxon's killing and, although they suspect what really happened, conclude that Dexter acted in self-defense. Dexter returns to the hospital during the evacuation and takes Debra off life support. He takes her body out to sea and drops it into the water. Once her body is gone, Dexter drives his boat into the hurricane in an apparent suicide attempt. A few days later in Buenos Aires, Hannah reads of Dexter's death. However, Dexter is revealed to have faked his death, and is now living under an assumed identity, working for a lumber company in Oregon.
