== Episodes ==

{{See also|List of Dexter episodes}}

<onlyinclude>{| class="wikitable" style="width: 100%; margin-right: 0;"

|-

! style="background: #ffff00; color: #000000;"| №

! style="background: #ffff00; color: #000000;"| #

! style="background: #ffff00; color: #000000;"| Title

! style="background: #ffff00; color: #000000;"| Directed by

! style="background: #ffff00; color: #000000;"| Written by

! style="background: #ffff00; color: #000000;"| Original air date

|-

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 37

|EpisodeNumber2 = 1

|Title = Living the Dream

|DirectedBy = [[Marcos Siega]]

|WrittenBy = [[Clyde Phillips]]

|OriginalAirDate = {{Start date|2009|9|27}}

|ShortSummary = Six months after the season 3 finale, Dexter is now living with three kids and a wife in a new home. Along with his new son Harrison, the complexities of being a suburban father of three is making it difficult for Dexter to concentrate on his work. Dexter's lack of sleep results in a murderer being released because Dexter brought the wrong case file to court. A recently retired Agent Lundy has returned to finally capture the "Trinity Killer", who has been at large for 30 years. After a call from Rita, Dexter quickly kills the released murderer but totals his car after falling asleep at the wheel.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 38

|EpisodeNumber2 = 2

|Title = Remains to Be Seen

|DirectedBy = [[Brian Kirk]]

|WrittenBy = [[Charles H. Eglee]]

|OriginalAirDate = {{Start date|2009|10|4}}

|ShortSummary = Suffering from [[amnesia]] following his car crash, Dexter begins searching for Benny Gomez' lost body, with a helping hand from Harry. Debra struggles with the return of her former lover while Quinn tries to juggle his personal and work life. Meanwhile, Trinity begins stalking his next chosen victim.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 39

|EpisodeNumber2 = 3

|Title = Blinded by the Light

|DirectedBy = Marcos Siega

|WrittenBy = [[Scott Buck]]

|OriginalAirDate = {{Start date|2009|10|11}}

|ShortSummary = When a local vandal begins stirring up trouble, Dexter's neighborhood becomes vigilant and wary, two things Dexter doesn't need. His mobility is also hampered by Rita, who insists on driving him around after his accident. Debra is upset when Anton announces he's taken a local job to spend more time with her. Meanwhile, the Trinity Killer dispatches his next victim. Debra becomes drawn to Lundy's theories about Trinity, while Dexter finds himself in awe of Trinity's masterful killing technique. Despite their enthusiasm, LaGuerta threatens to shut down the investigation, instead focused on bringing the Vacation Murderers to justice.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 40

|EpisodeNumber2 = 4

|Title = Dex Takes a Holiday

|DirectedBy = [[John Dahl]]

|WrittenBy = [[Melissa Rosenberg]] & Wendy West

|OriginalAirDate = {{Start date|2009|10|18}}

|ShortSummary = While Rita and the kids are out of town for a wedding, a lady police officer ([[Christina Cox]]) comes onto Dexter's radar. The officer is a kindred spirit, and highly suspicious of Dexter's motives. LaGuerta and Angel discuss full disclosure to the higher Brass, pulling Dexter unwillingly into the middle of their problem. Meanwhile, Quinn's reporter girlfriend, Christine ([[Courtney Ford]]), uses their relationship to put out a story how Lundy's hunt for a phantom killer pulls time away from the Vacation Murders. This puts a strain on Lundy's retirement project when his visitor's pass to Miami Metro is revoked. Having to take the project out of the office, old sparks heat up between Lundy and Debra.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 41

|EpisodeNumber2 = 5

|Title = Dirty Harry

|DirectedBy = [[Keith Gordon]]

|WrittenBy = [[Timothy Schlattmann|Tim Schlattmann]]

|OriginalAirDate = {{Start date|2009|10|25}}

|ShortSummary = Recent events spur Dexter into his own investigation of the Trinity killer. His motivations are now personal, and the clock is ticking. But the closer Dexter gets, the more he realizes that Trinity is unlike any monster he's previously encountered. Meanwhile, Debra blames herself for events that were out of her control, and in doing so pushes away those closest to her. As LaGuerta and Batista close in on the Vacation Murderers, Batista realizes he can use Quinn's relationship with a certain reporter to his advantage. And when Rita discovers a secret Dexter's been keeping from her, she begins to realize just how little she knows about the man she married.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 42

|EpisodeNumber2 = 6

|Title = If I Had a Hammer

|DirectedBy = Romeo Tirone

|WrittenBy = [[Lauren Gussis]]

|OriginalAirDate = {{Start date|2009|11|01}}

|ShortSummary = 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. Dexter has begun to realize that the closer he gets to Trinity, the more he stands to learn from this very different beast. Trinity 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.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 43

|EpisodeNumber2 = 7

|Title = Slack Tide

|DirectedBy = [[Tim Hunter (director)|Tim Hunter]]

|WrittenBy = Scott Buck

|OriginalAirDate = {{Start date|2009|11|08}}

|ShortSummary = A dismembered human arm is found inside an alligator, leading Dexter to his next victim, Jonathan Farrow, a photographer, who shoots fairly gruesome pictures of models, apparently killing Latina models who were in America illegally (ensuring no missing persons reports would be filed). Family and work taking its toll, a hurried Dexter accidentally makes his greatest single mistake and violates The Code of Harry. Meanwhile, Trinity appears to be disturbed, and is unable to put a doe out of its misery after hitting it with his car. He then proceeds to build a coffin with lumber he obtained with Dexter's help. In order to get more 'alone time', Dexter, acting upon Trinity's advice, attempts to involve his kids in more activities, only to get pulled into the activities with them. After threatening Quinn to keep his girlfriend reporter away from Deb, Quinn starts digging into Dexter's past and makes his life a lot more difficult.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 44

|EpisodeNumber2 = 8

|Title = Road Kill

|DirectedBy = [[Ernest Dickerson]]

|WrittenBy = Melissa Rosenberg & Scott Reynolds

|OriginalAirDate = {{Start date|2009|11|15}}

|ShortSummary = 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 Trinity 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 Trinity 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.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 45

|EpisodeNumber2 = 9

|Title = Hungry Man

|DirectedBy = John Dahl

|WrittenBy = Wendy West

|OriginalAirDate = {{Start date|2009|11|22|}}

|ShortSummary = 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, while Debra uses the holiday to continue her investigation of the Trinity Killer, a pursuit which threatens her brother's safety and brings to light surprising revelations about someone else close to her.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 46

|EpisodeNumber2 = 10

|Title = Lost Boys

|DirectedBy = Keith Gordon

|WrittenBy = Charles H. Eglee & Tim Schlattmann

|OriginalAirDate = {{Start date|2009|11|29|}}

|ShortSummary = Dexter finally believes he understands the beast known as Trinity. But when a ten-year-old boy ([[Jake Short]]) goes missing, Dexter is forced to question everything he's learned up to this point. It's a race against the clock. 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 - from Cody, who is forced to defend one of Dexter's lies, Masuka, who can't bring himself to confess what he witnessed at Thanksgiving, and Debra, whose recent discoveries force one of Miami's finest into making an impossible decision.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 47

|EpisodeNumber2 = 11

|Title = Hello, Dexter Morgan

|DirectedBy = SJ Clarkson

|WrittenBy = Scott Buck & Lauren Gussis

|OriginalAirDate = {{Start date|2009|12|6|}}

|ShortSummary = 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 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.

|LineColor = ffff00

}}

{{Episode list/sublist|List of Dexter episodes

|EpisodeNumber = 48

|EpisodeNumber2 = 12

|Title = [[The Getaway (Dexter)|The Getaway]]

|DirectedBy = [[Steve Shill]]

|WrittenBy = ''Teleplay by:'' Wendy West & Melissa Rosenberg<br />''Story by:'' Scott Reynolds & Melissa Rosenberg

|OriginalAirDate = {{Start date|2009|12|13|}}

|ShortSummary = 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. Batista and LaGuerta face the consequences of their actions and now that they are married agree to move in together. Debra finds out 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 succeeds in capturing and killing Arthur, but then goes home to find Rita killed in the same manner as the other Trinity bathtub victims, and Harrison, alive, sitting in a pool of Rita's blood.

|LineColor = ffff00

}}

|}</onlyinclude>