The Replicator (Criminal Minds)

John Curtis or simply known as The Replicator is a serial killer copier of many other serial killers that BAU had faced, he is also the main antagonist of the season Eight of Criminal Minds.

He portrayed by Mark Hamil.

Biography
Little is known about Curtis's previous life besides being the son of his parents who were killed in a car accident in the year 1969. In addition to his FBI record, he had an IQ 172. During his years at the FBI he worked as a brilliant and reclusive FBI agent. He also worked on the Ameritrax case along with Alex Blake and Erin Strauss. But when the case turned to the south and they arrested a suspect, both he and Alex were downgraded because Strauss blamed them and managed to save his career. Curtis later transferred to Kansas City and was seen as undesirable to hold in 2005. He was later promoted to Special Agent, shortly after 3 years later, Curtis was then transferred to work as an FBI field office in Chicago.

Shortly after 3 years, he was promoted back to the same position in which Strauss had been demoted, and to work it in the office of the D.C field, like a Supervisory Special Agent. He was later assigned to work in a Department of Justice's Intelligent Oversight Section. Because of his sudden downgrades of positions Curtis began to blame Strauss and has given revenge because if it, and for this and began to chase after his staff as revenge and took the photos of the members of BAU.

The Silencer
Sometime later, Curtis appears copying the modus operandis of an unknown serial killer in Seattle killing his victim. And then soon after the end of the episode Curtis appears with photos of all BAU members and putting them as the main target.

The Apprenticeship
After the team solved the case of serial killers David Turner and Toby Whitewood, he receives a call from the authorities in Dallas, informing them that someone killed a man with the same MO as John Myers or The Silencer a serial killer who killer people putting something in their mounths, since it is seen that John Myers is this, then BAU conclude that he is an imitator and so they decide to investigating this further. At the end of the episode Curtis is seen taking pictures during a shoftball match in his car.

Magnificent Light
Curtis then appears where Morgan and Garcia are watching her. While Morgan makes the speech, Curtis a glass of wine in which Morgan was and puts if in plastic bag takes if and puts it in hid table. He then copies then copies the signature of John Nelson killing his victim simply by cutting his leg and replacing by another by the leg of the third victim.

Perennials
After solving the case of serial killer Willie Kestler, Hotch and Rossi informs the team in a informs the team in a briefing room about Curtis's imitation of some of the serial killers that BAU had solved and that they would investigate about it.

Zugzwang
Curtis makes a short appearance and gives a public phone call at the home of Maeve Donovan in which he identifies himself as Adam Worth and speaks the word Zugzwang at the time, Reid the other members of BAU though that it was Diane Turner the pursuer of Maeve and that already that both Reid and Maeve used names related to Arthur Conan Doyle in their correspondences.

Broken
Curtis appears at the end of the episode and watching a BAU news coverage live while he sees photos of his victims on his laptop, and it is also revealed that he copied another serial killer Adam Rain and killed a woman in the same style as him.