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Dexter suspects rich women's shrink of murder. When he visits the shrink, he is surprised by a dark secret from his past.
The final challenge between Dexter and Arthur comes. Debra finds out a long hidden truth. Rita admits that her marriage is troubled. Batista's and LaGuerta's relationship must face consequences.
Dexter is called to the scene of the crime at the Castillo junkyard. The Ice Truck Killer has returned Valerie Castillo's body putting Dexter in danger of being caught. A boy is found who witnessed the crime.
In the season finale, religious zealot Travis (Colin Hanks) continues his plan to bring about the end of the world, leading him to kidnapping Dexter's (Michael C. Hall) son, resulting in a climatic and bloody battle between the two of them on a boat.
Debra tries to reconcile with her brother while trying to cover up the murder she witnessed in the Season 6 finale.
The team investigates murders that have a religious undertone to them.
Sal Price learns about Dexter and Hannah's relationship and helps Debra to dig up more information on Hannah. Quinn goes on extreme to protect his girlfriend.
Dexter investigates who shot Brother Sam. Meanwhile, Homicide interrogates the woman who Quinn slept with who is involved in the Doomsday Killer case.
Miami Metro continues the search for the Brain Surgeon. Dexter finds a clue and attempts to find the Surgeon before his colleagues. Dexter gets a bit closer to Dr. Vogel. Dexter keeps attempting to bridge the gap that has formed between him and Deb. Deb is forced to take matters into her own hands as she tries to find the jewels that Biggs had stolen.moreless
In order to solve the mysterious murders, Homicide asks for the help of Brother Sam, who Dexter knows used to be a serial killer. Debra has two proposals, one personal and one job-related.
Dexter is conflicted with the phone call that Deb made to him. He has to make a decision between Hannah and his sister. It goes beyond that though, will he honor his own code? Another problem arises when Aster and Cody's grandfather has a kidney stone and the kids end up with Dexter. This can be very dangerous when he has a target on his head from Issac. Dexter also saves Issac's life by accident. We also find out why Issac so desperately want Dexter's dead, Issac is holding on to a secret.moreless
Deb discovers that LaGuerta sent some forensic evidence to an outside lab. LaGuerta confides in Deb that she found Dex's blood slide and is convinced that the Bay Harbor Butcher is still active and Doakes was innocent. Deb offers to help LaGuerta, so that she can steer theinvestigationaway from Dexter ifnecessary. Dexter discovers blood on his boat and finds out that Isaak is after him. Hannah McKay is back to help find some of the victims from the killing spree. Dexter finds something interesting while studying one of the unearthed bodies.moreless
Deb and the police catch Ray Speltzer. They work him and get a confession. After a video of Ray's arrest reveals that the officers did not properly Mirandize him, they are forced to let him go. Dexter realizes that this is his chance to take Ray out in his own special way. Dexter realizes that some things have to change if he can continue to keep himself separate from guys like Ray. The strip club is still being raided and Isaak has had enough. He decides to give the police what they want, even if it means framing an innocent man.moreless
Dexter is surprised to find that Issak comes to him for help when his life is in danger but because Issak has had Hannah kidnapped Dexter has to cooperate. La Guerta shares her theory to Mathews about the Bay Harbor Butcher and Debra is embarrassed about telling Dexter that she's in love with him.moreless
When the Phantom arsonist kills again, Dexter moves closer to finding his identity. Dexter explains his dark passenger to Hannah while she is visited by her father who hasn't always been the best father to her. Quinn has a final confrontation with George Novikov who decided to send Nadia to another club. LaGuerta tells Matthews that she thinks Dexter is the Bay Harbor Butcher and they both try to resolve a way to deal with the situation.moreless
When LaGuerta arrests Dexter he shows its far from over and he plans to finish what he started with Hector Estrada. With LaGuerta close to proving that Dexter is the Bay Harbor Butcher in front of everyone, Dexter is left no choice but to deal with LaGuerta and close the Bay Harbor Butcher case once and for all.moreless
A local crime writer Sal Price attracted to Debra and she used this to get info on Hannah McKay. But Dexter is already planning to kill Hannah. Quin gets an strange offer and Batista wants to retire and open a restaurant. Meanwhile, LaGuerta is near getting new evidence in the Bay Harbor Butcher case.moreless
Dexter continues the search for the Brain Surgeon. Meanwhile Deb finds help in an unexpected source when her post tramatic stress disorder kicks in.
Dexter faces a serial killer from his past; Debra has problems with her new position and Travis with Gellar think of their next move.
Six Months after LaGuerta's death, Deb has left the police force for private security. Dexter and Deb are barely speaking. A new serial killer dubbed "The Brain Surgeon" is in Miami. Dr. Evelyn Vogel, a psychiatrist known as the "sociopath whisperer" offers her help to Miami Metro. She may hold clues to Dexter's past.moreless
Dr. Vogel comes into contact with the "Brain Surgeon". Dexter and Deb try to keep her safe. Masuka learns that he has a daughter.
Dexter uses his 20 year high school reunion as a chance to hunt the prom king. It's going fine until he is called to the scene of a vicious faith-based murder leaving him with questions about what he wants to pass on to Harrison. Debra who is finally in a good place with her relationship with Quinn and her job becomes an unexpected hero.
Dexter, using what he's learned from Brother Sam, comes a step closer to the Doomsday killers, specifically Travis; Deb and LaGuerta go head-to-head after a call girl ends up dead.
Dexter goes in search of another serial killer from Dr. Vogel list. Quinn passes the seargent exam. Dr. Vogel treats Deb for her PTSD.
The mirror-match continues. Travis enlists some new acolytes. Miami Metro gets two new breaks. Dexter finds himself in hot water, confused about what to do with Wormwood.
Dexter tries to stay one step ahead of the Homicide Division concerning the Doomsday Killers, while he finds help from an unlikely source; Debra uncovers something unexpected about herself during her therapy sessions.
Dexter and Quinn both look into Zach Hamilton as a potential murder suspect. Meanwhile, Deb goes undercover in a new case that has personal attachment for Elway.
Danger arrives to Miami Metro. Dexter continues to try and lure Travis in while Deb continues to see her therapist.
Dexter hunts down Hannah to figure out why she is in Miami. Dexter takes on a protégé and teaches him the code.
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.moreless
Miami Metro gets closer to Gellar and Travis thanks to the new intern. Meanwhile Dexter deals with faces from the past. Travis tries to move on from Gellar.
LaGuerta now believes that Dexter is the Bay Harbor Butcher and sends Matthews to talk to him. Dexter also must find a way to kill the last of his mother's killers when Hector Estrada is released. Dexter also questions Hannah about when Debra mysteriously just blacks out leading to a car accident. Quinn learns that Nadia has skipped town.moreless
Dexter tries to get to the bottom of Zach's murder, whilst at the same time keep Hannah hidden from the US Marshall who has come looking for her. Vogel comes face-to-face with a ghost from her past.
After helping Quinn with some investigative work, Deb toys with the idea of returning to Miami Metro.moreless
Dexter series finale