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12 Episodes 2011 - 2011
Episode 1
Sun, Oct 2, 201154 mins
In the Season 6 premiere, Dexter Morgan attends his 20th high school reunion to hunt a former Prom King; Homicide's investigation into a gruesome, faith-based murder causes Dexter to ask some spiritual questions and consider his son's legacy; solid in her relationship with Quinn and her role as detective, Debra becomes an unexpected hero.

Episode 2
Sun, Oct 9, 201153 mins
To solve a mysterious and macabre murder, Homicide brings in Brother Sam, a minister with a criminal past whom Dexter recognizes as a fellow killer that might have found a cover even better than his own; now a local hero, Debra is surprised by two life-changing proposals.

Episode 3
Sun, Oct 16, 201150 mins
Dexter is confronted with a sobering glimpse of his own potential future when a serial killer from his past makes a startling reappearance; Debra is uncomfortable in her new job; Travis struggles to keep his mentor happy, as he and Gellar prepare a new twisted tableau, ensuring Debra's next task will be a daunting one.

Episode 4
Sun, Oct 23, 201152 mins
Much to his own surprise, an emergency with Harrison and a new tableau from Gellar and Travis has Dexter leaning on Brother Sam and an unexpected winged messenger for support as he questions the idea of faith; with proof of a religiously motivated killer, Homicide hunts for a zealot, with Debra giving her first official press conference.

Episode 5
Sun, Oct 30, 201151 mins
With the help of his newfound friend Brother Sam, Dexter wonders if there is light within him to counter the darkness, while the search for the Doomsday Killers takes him in a new direction; Batista and Quinn pay a visit to the university where Professor Gellar taught; due to departmental regulations following the shooting, Debra is forced to begin therapy.

Episode 6
Sun, Nov 6, 201154 mins
Dexter is caught up in a very personal case that awakens the needs of his Dark Passenger; Debra feels overwhelmed by her new Lieutenant duties, made all the more complicated when she finds out Quinn slept with a witness in the Doomsday case.

Episode 7
Sun, Nov 13, 201152 mins
Dexter disposes of Nick's body in the ocean after having drowned him in the previous episode. Debra faces scrutiny because her department's case clearance rate is low. Dexter finds out that Rebecca and Sally Mitchell (the daughter and wife of the Trinity Killer) have been killed, which son Jonah blames on his father (who only Dexter knows is dead). He drives to Nebraska to confront Jonah, who reveals that his mother blamed her children for their father's actions, causing Rebecca to commit suicide; following this, Jonah beat his mother to death in anger. Dexter lets Jonah live, telling him to forgive himself. Meanwhile, back in Miami, Masuka and his new intern find a lead related to Doomsday. Travis tells Gellar that he is done working for God and moves in with his sister.

Episode 8
Sun, Nov 20, 201152 mins
Dexter, using what he's learned from Brother Sam, persuades Travis to help him get Gellar, but Travis is kidnapped by Gellar for further rituals. Meanwhile, Debra and LaGuerta go head-to-head after a call girl ends up dead when LaGuerta wants Deb to stop the investigation. After Debra interrogates Travis's sister as part of the DDK investigation, the sister is found dead, posed as the "Whore of Babylon." Batista has dinner with Jamie and Louis but doesn't take too kindly to Louis dating his sister. Also, Quinn takes Masuka on a night on the town to a strip club where Quinn gets extremely drunk again and asks a stripper to marry him.

Episode 9
Sun, Nov 27, 201150 mins
Dexter attempts to stay ahead of Miami Metro Homicide on his hunt for Gellar, who plans on killing a radical atheist professor, but Dexter fails to stop him after he gets trapped in an elevator. Batista helps Quinn recover his gun that he left in the car of a one-night stand. Dexter later discovers the frozen corpse of Professor Gellar in a freezer in the abandoned church basement and realizes Travis was the sole killer all along; the Professor Gellar that Travis interacted with is actually his dark passenger. Jamie and Louis take a step further in their relationship. LaGuerta meets with Chief Matthews to tell him Debra won't back off on investigating who was with the call girl who overdosed.

Episode 10
Sun, Dec 4, 201149 mins
Travis teams up with a religious and fanatic couple, named Adam and Beth Dorsey, whom he met via Gellar's blog, to kill Holly Benson (the former Whore of Babylon whom he let go) and to unleash the next tableau, Wormwood, a poison which Travis re-imagines as poison gas. Dexter tries to get one step ahead of the Doomsday Killers and figure out where their next victim could possibly be before they attack again. Meanwhile, Debra begins to realize she relies too much on her brother after reacting to a crime scene.

Episode 11
Sun, Dec 11, 201148 mins
Travis tasks Beth with unleashing Wormwood poison gas in the Miami Metro squad room, but she's stopped by Dexter, saving everyone's life. Debra has dinner with Chief Matthews where she confronts him about being implicated in the dead call girl case. When Matthews is forced to retire, she realizes that LaGuerta has been manipulating her throughout the case. Dexter stages a fake Doomsday Killer tableau in order to draw out Travis, but is captured himself and becomes a part in the final tableau, the "Lake of Fire". Debra's therapist prompts her to consider whether she may actually be in love with her adopted brother.

Episode 12
Sun, Dec 18, 201151 mins
Dexter is rescued by a boat of illegal immigrants. Debra dispatches officers to skyscrapers in downtown Miami on a hunch that this is where the final tableau will be executed. Travis sees that the police have found his hideout, so he retreats to Dexter's apartment. Realizing that Harrison is Dexter's son, Travis kidnaps Harrison to use him as his sacrificial lamb in his final act to bring about the end of the world, but is stopped by Dexter who knocks him out, but does not kill him. Dexter takes the unconscious Travis to the abandoned church, where he kills him. Debra, checking in on Dexter at the church, discovers her brother's shocking secret.
