Oliver Saxon

Oliver Saxon is the main antagonist of the eighth and final season of the TV series ''Dexter. ''He is a serial killer known as "The Brain Surgeon" who removes parts of his victims' brains, and who becomes Dexter Morgan's nemesis.

Backstory
Saxon was born Daniel Vogel, the son of neuropsychiatrist Evelyn Vogel and her husband Richard. He displayed psychopathic behavior from a young age, and his mother diagnosed him as a "perfect psychopath", a predator devoid of conscience and empathy - a diagnosis that proved all too tragically accurate when he murdered his twin brother Richard, Jr. because he was jealous of the attention his sibling was getting. Evelyn had him institutionalized, but he set fire to the hospital - killing seven other children in the process - to fake his own death. He reinvented himself as "Oliver Saxon", and as an adult became a serial killer, removing the parts of his victims' brains that controlled empathy and impulse control - a dig at his mother, who staked her professional reputation on the theory that psychopaths were the product of faulty brain chemistry.

In Dexter
Saxon first appears as the boyfriend of Dexter's neighbor, Cassie Jolliston. When Cassie is murdered, Saxon is apparently devastated - a perfect cover, as it is later revealed that Saxon himself murdered her. He then murders Dexter's "protege", Zach Hamilton. Dexter recovers DNA evidence from Zach's murder, analyzes it, and realizes that the killer is related to Evelyn, who by seeming coincidence was instrumental in creating Dexter's "code" of only killing other killers. Upon learning of Saxon's true identity from Evelyn, Dexter decides to kill him. Saxon gets the better of him, however, and slits Evelyn's throat right in in front of him.

Saxon agrees to meet with Dexter, and threatens to kill everyone Dexter holds dear unless Dexter leaves him alone. Dexter pretends to agree to the truce, but secretly decides to kill him. Dexter incriminates Saxon in the Brain Surgeon murders, in the hopes that Saxon will go after him. Sure enough, Saxon breaks into Dexter's apartment, where Dexter incapacitates him. At the last minute, however, Dexter decides not to kill Saxon, preferring instead to let his adoptive sister Debra arrest him. Saxon gets the better of Debra, however, and shoots her in the gut. This injury eventually leads to Debra suffering a stroke that leaves her in an irreversible coma. Saxon is arrested soon afterward. Desiring revenge, Dexter arranges to visit Saxon in his cell, and kills him by stabbing him in the neck with a pen.