Gabriel Gray, more commonly known by his assumed name of Sylar (a name obtained from a brand of watch he encountered as a watchmaker), is one of the primary antagonists and antiheroes in the NBC drama Heroes. Portrayed by Zachary Quinto, he is a superpowered serial killer who targets other superhumans in order to steal their powers. He served as the primary villain of the first season and then as a recurring antagonist. After being rescued from a mental prison by Peter Petrelli in "The Wall", Sylar has now identified himself as a hero in "Brave New World".
Sylar's base power, as described by Chandra Suresh, is "intuitive aptitude", the ability to innately understand and manipulate patterns within complex systems, which initially manifests as a talent for repairing timepieces. As revealed in "One of Us, One of Them", this power comes with a nearly insatiable hunger for "understanding", which, in Sylar's case, specifically refers to craving the powers of others, driving him to kill other superpowered humans to understand their powers and make them his own. Despite the strength of this hunger, two episodes have shown that it can be resisted or satiated: in the alternate future of "Five Years Gone", Sylar has taken on so many abilities that he simply desires to get rid of all of his potential "competition" (other superhumans, to be exact); in the future of "I Am Become Death", he has resumed his identity as Gabriel Gray and denies his hunger for the sake of his son. In "Once Upon a Time in Texas" it is revealed that Sylar can also identify deformities in people such as Charlie's blood clot and Hiro's brain tumor.
Sylar's intuitive aptitude allows him to deduce the workings of the powers of others; by examining the brain of his victim, he is able to find the brain's connection to the ability, and once he finds said connection, he can immediately replicate the power himself. However, he cannot acquire an ability from a dead person, even if their brains are intact. In "Fallout", Noah Bennet theorizes that Sylar's additional powers are a product of using foreign DNA to alter his own which, as a side effect, has driven him insane.
Of all the powers Sylar has acquired, the most prominently used is telekinesis, which is the first power he took. In contrast to the limited abilities Brian Davis displayed, Sylar's skills are far more advanced; he exhibits both fine control (precisely cutting open the skulls of his victims) and sheer force (flipping a police van), can enhance his own strength and durability to superhuman levels,[6] and can control a person's motor skills in a manner similar to Eric Doyle's puppet mastery. Tests done on Sylar by Bennet's associate Hank show no overt signs of powers other than telekinesis; while their tests show that he possesses other powers, they are unable to identify what they are. In "The Hard Part", Sylar demonstrates he can use at least two of his acquired abilities at the same time.
http://en.wikipedia.org/wiki/Sylar#Powers.2C_abilities_and_skills
Arthur Mitchell is a middle-aged serial killer who has been active for three decades without being noticed. Agent Frank Lundy, the FBI's lead investigator of his crimes, has dubbed him "The Trinity Killer" because it was believed that he killed in threes. However it has since come to light that he in actuality kills four victims every cycle. His M.O. is to kill a series of four people in a very specific fashion. The first victim is a young boy, usually around the age of 10, whom he buries alive in wet concrete. The second victim is a young, single female, whom he forces into a bathtub with him. He then severs her femoral artery and watches them bleed to death in a mirror. His third victim is a slightly older woman, married with two children. He brings her to the top of a building and forces her to jump to her death. The fourth and final kill in his pattern is an older male, also a parent of two children, whom he bludgeons with a hammer. He's immaculate, always careful never to leave any trace of his presence at the scenes of his crimes. Through his killings, he's recreating the traumatic deaths of his own family members. He performs this cycle roughly twice every year.
Arthur Mitchell has killed roughly around 240 people over the past 30 years.
http://dexter.wikia.com/wiki/Arthur_Mitchell
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