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12 Episodes 2009 - 2009
Episode 1
Sun, Sep 27, 200954 mins
Dexter sleeplessly struggles to balance his new family life with his dark, murderous drive for a fresh victim, and his busier-than-ever forensic career pursuing a new target, "The Trinity Killer."

Episode 2
Sun, Oct 4, 200949 mins
Dexter realizes that he has carelessly misplaced crucial evidence that could expose his dark side to the world, while helping to investigate new slayings that Agent Lundy insists are the work of Trinity.

Episode 3
Sun, Oct 11, 200951 mins
Dexter is hampered by his neighborhood's increased vigilance due to vandalism, his temporary inability to drive himself anywhere, and his admiration for the killing technique of the artful Trinity Killer.

Episode 4
Sun, Oct 18, 200955 mins
Dexter gets some much-needed R&R time with Rita and the kids out of town, leading to his stalking of a new victim - until he unexpectedly begins to empathize with his target, a cop that murdered her family.

Episode 5
Sun, Oct 25, 200949 mins
Dexter is inspired to investigate the Trinity Killer on his own, while Debra blames herself for an event that was out of her control, and Rita realizes how little she knows her husband after discovering one of his secrets.

Episode 6
Sun, Nov 1, 200955 mins
Dexter knows it's only a matter of time before Miami Metro discovers the Trinity Killer's latest handiwork. Therefore, he has to work doubly hard to stay one step ahead of their investigation. Under the alias of 'Kyle Butler', Dexter has begun to realize that the closer he gets to Trinity, the more he stands to learn from this very different beast. As the friendly building contractor Arthur Mitchell, the Trinity Killer hides behind a well-kept mask; and getting behind that facade will require some extra prodding on Dexter's part. Meanwhile, Debra becomes frustrated when she finds herself shut out from her own case. She considers bending the rules in the name of justice, risking her career in the process. LaGuerta and Batista come to regret a major decision, and realize that by playing by the rules they may have painted themselves into a corner. And when the friction between Rita and Dexter comes to a head, Dexter gleans relationship advice from a most unlikely source.

Episode 7
Sun, Nov 8, 200953 mins
Dexter finds himself enjoying a brief moment of tranquility. He's finally managed to strike a balance between work, family and other pursuits. But he's keenly aware that times like these aren't meant to last. When Miami Metro discovers a string of murders connected to a prominent photographer, Dexter sees an opportunity for a clean kill.

Episode 8
Sun, Nov 15, 200954 mins
Dexter has always known his father's Code was meant to protect him from exposure. But after committing a serious mistake, he wonders if it could have been designed to protect him from something even more dangerous - human emotion. When he discovers that Arthur is planning an out-of-town trip, Dexter sees an opportunity to ride along and gain insight into the mind of a fellow monster. Even so, Dexter isn't prepared for the startling revelations Arthur makes along the way, revelations about his own past which only serve to convince Dexter of what he must do. Meanwhile, back at Miami Metro, Debra refuses to let a technicality keep her off the Trinity case. She works through others to ensure her voice is heard - that is, until she realizes that her single-minded pursuit of the Trinity Killer may have blinded her to the truth.

Episode 9
Sun, Nov 22, 200951 mins
For most people, Thanksgiving is a time for traditions and family, but for Dexter, it's an opportunity to get closer to his most dangerous adversary yet. As Dexter gains insight into Arthur's psychology by studying those closest to him, he finds himself drawn into a bizarre and twisted world. Meanwhile, Rita has her hands full preparing dinner for a packed house, including a few unexpected guests. Batista gets closure on an old case. Meanwhile, Debra uses the holiday to continue her investigation of the Trinity Killer, a pursuit that threatens her brother's safety and brings to light surprising revelations about someone else close to her.

Episode 10
Sun, Nov 29, 200957 mins
Dexter finally believes he understands the beast Arthur Mitchell, known as the Trinity Killer. But when a ten-year-old boy goes missing, Dexter is forced to question everything he's learned up to this point. It's a race against the clock to find the boy before Trinity kills him, and with each step forward, Dexter has to confront the real possibility that he may have more in common with Trinity than he'd like to admit. Secrets abound: Cody defends one of Dexter's lies because he doesn't think Dexter would ever lie to him; Masuka, can't bring himself to confess what he witnessed at Thanksgiving; and Debra's recent discoveries force one of Miami's finest into making an impossible decision.

Episode 11
Sun, Dec 6, 200951 mins
Dexter's worst fears have been realized. Because of Debra's unrelenting pursuit, Miami Metro is just one step away from discovering the identity of the Trinity Killer. And Dexter can't let that happen. Arthur's arrest would not only deprive Dexter of a satisfying kill, it would also expose the secret life Dexter's been leading (as Kyle Butler) in his pursuit of this monster. Dexter must take drastic action to buy himself time to deal with Trinity in his own fashion. Meanwhile, Rita decides to confide in Dexter, which doesn't go as well as she'd hoped. LaGuerta and Batista's breach of ethics paints them into a very tight corner. And Arthur, who still can't understand why Dexter didn't simply turn him in, begins his own bloody investigation into 'Kyle Butler'.

Episode 12
Sun, Dec 13, 200951 mins
**SPOILER ALERT!!** As the noose tightens, Arthur warns Dexter to back off. But Dexter will do anything to stop Arthur from eluding him, even if that means putting himself on the wrong side of the law. Rita acknowledges the rocky relationship she and Dexter share, but reaffirms her support. Meanwhile, Batista and LaGuerta face the consequences of their actions and now that they are married agree to move in together. Debra finally learns that Dexter is the Ice-Truck Killer's brother and tells Dexter. She then tells him he is the only constant truly good thing in her life and that she loves him. At the culmination of the episode, Dexter finally captures and kills Arthur, but then goes home to find Rita dead - apparently killed by Arthur hours earlier in the same manner as the other Trinity bathtub victims. Dexter finds Harrison at the scene of the crime. He was spared, but forced to witness Rita's murder, and is left sitting in a pool of her blood - exactly as Dexter had once been. Dexter flasheÏs back to Harry carrying him out of the shipping container where his mother was murdered as he carries his blood-soaked son out of the house.
