One of a lawyer's identical twin daughters is kidnapped. The kidnapper contacts him and demands ransom money. The team's investigation, however, reveals that he doesn't really want the money, but both girls.

The team chases a sniper in Des Plaines, Illinois who for some reason only wounds his victims.

The team attempts to catch a killer who preys on families while they are supposed to be on vacation.

The disappearance of an undercover officer in relation to a triple murder puts the BAU on the hunt of a possible serial killer who's turned it into a profession.

A paranoid schizophrenic takes other passengers on a train hostage, including Elle.

The apparent death by Satanic ritual brings the BAU to a small town, and the profiling morphs into a search when it's learned that a teenage girl is missing.

The BAU team must profile a delusional killer in rural Tennessee, and a family member protecting him puts a child at risk.

The team must determine whether an abducted girl is the pawn in a bitter divorce, or something more sinister has happened.

The apparent spiking of citizens of a town in New Jersey, puts the BAU on the trail of a poisoner who may not be done.

The team of investigators interview husband and wife serial killers with their execution date set for two days time.

When a serial killer reappears, the team works with a retired BAU agent who just published a book about the perpetrator.

The massacre of students using Native American rituals leads the team to consult the reservation policeman, who is also an activist.

The team travels to Manhattan to work with the NYPD in tracking and apprehending a serial killer who is intent on dispensing his own style of vigilante justice.

In town to conduct a seminar, Gideon and Reid become involved in a stalker case that has escalated to murder.

The BAU is requested to assist on a case in Mexico to determine if there is a serial killer in the town of a police captain who attended one of Gideon's seminars.

Reid has been kidnapped, and the BAU's only things to profile are a house, a computer, and the live feed the kidnapper is sending to them.

The death of four African-American girls in a a predominately white community brings the BAU in to try to solve the case before racial tensions explode into violence.

The seemingly random killings in a Houston ward bring the BAU down for the profile, but finding the pattern proves difficult.

The BAU travels to New Orleans' French Quarter where a Jack the Ripper type serial killer is on the loose.

The team tries to identify a serial arsonist who has escalated to murder.

The BAU finds themselves sparring with the Russian Mob, but even more puzzling is the behavior of one of the victims.

The team is called to investigate when bodies of missing people are discovered in the Idaho wilderness.

A detective presents himself at the BAU, asking for help because the homeless in his area have begun to disappear.

Frank is back on the hunt, and the team must protect Gideon while he profiles Frank again. Elsewhere, the team faces a review with some surprising results.

The team tries to identify a serial killer based on a shaky profile with devastating consequences.

With Gideon still missing, Hotchner puts in for a transfer and Prentiss tenders her resignation, but both are drawn back to work by a serial killer targeting women in a particularly heartless fashion.

The unit tracks a man working through his fears by working them out on others.

The BAU travels to Denver, Colorado, where they investigate a series of home invasions that end in the murders of entire families. However, the case takes a turn when they begin to suspect that the killers were once-abused children.

The unit works against the clock when a little girl disappears in a mall, believing a serial killer has struck a second time and the first girl died within an hour of abduction.

The team gains a new, familiar member and some growing pains while trying to find the latest victim of a killer who puts up wanted posters of his victims before he abducts them.

The unit has to deal with the militia when they're called to rural Montana to track a killer who's obsessed with his mentor.

A killer is abducting women and forcing them to eat fingers before killing them, Rossi plays with Morgan's head, and Garcia meets a man at the local coffee shop.

More is learned about Garcia while the team tries to find the persistent unsub threatening her.

The team heads to LA to investigate a number of brutal killings which turn out to be related to the creator of a graphic novel, Jonny McHale.

The team travels to Fredericksburg, Virginia, where women are being abducted, burned and mutilated. Soon it turns out that similar killings happened in the 1980s.

Two teenage girls go missing, one of which is soon found dead and freshly buried. The team soon suspects that the killings are related to the witness protection program.

The auction of the contents of a self-storage facility in Philadelphia reveal a possible serial killer in the making.

Rossi determines that the case that haunts him has gone unsolved too long on its 20th anniversary, and the team horns in on his investigation despite his displeasure. Elsewhere, Reid and Hotchner interview a manipulative death-row convict.

An unusually high suicide rate in Pittsburgh appears to be the work of an Angel of Death.

When a spree killing begins in a small Texas town, Reid's identification with the killer may endanger the girl with him, and cause Reid to put his own life in jeopardy.

The team travels to Miami in pursuit of a serial killer whose conflicted sexual identity fuels his crimes.

As a favor to the D.A. in Boston, Hotchner and Rossi profile a woman who murdered her husband, though the D.A. may not like their findings. Back at the office, J.J.'s personalization of a stalker case baffles the rest of the team.

A suspected serial killer who's been in a coma since 2004 due to an accident when he was arrested wakes up 4 years later, with no memory of his past, not even his name. While he is tried in court, in which Hotch is testifying against him, the rest of the team investigates his past further.

People who apparently have nothing in common are being shot randomly in New York City and the team must determine whether it is the work of a single shooter or a team.

A man is jumping trains along Highway 99, brutally killing couples in their homes whenever he stops.

A child abduction case in Las Vegas causes Reid to have strange nightmares which appear to be connected to an event in his past.

Driven by his nightmares, Reid stays behind in Las Vegas to find his father in order to find out the truth about Riley Jenkins' murder.

A serial killer turns himself in and challenges the team to find five people he has hidden somewhere before they die.

A greatly sadistic serial killer who disembowels women and forces them to clean it up before killing them proves difficult to catch thanks to his social charm and simple, yet clever, disguises.

Morgan, an ex-cop, takes it personally when a serial killer targets police officers in Phoenix, Arizona.

A serial killer known as the Road Warrior is gunning down blonde women on roads in Orange County, California and the BAU suspect that the victims are surrogates and that it's only a matter of time before he kills the real one.

The team suspects that a member of an affluent community is responsible for the disappearance of a young woman.

A family consisting of two parents and their son break into a home, kill the parents and kidnap their daughter. As the investigation proceeds, the BAU team begin to suspect that what they're dealing with is bigger than they thought.

A serial killer in the Olympia, Washington area has abducted four blonde, twenty-something women. When the third victim is found embalmed, the BAU are called in and suspect that the embalming is a way for him to spend more time with them.

A copycat serial killer is recreating murder techniques used by famous killers from the past.

Prentiss learns from an old friend, John Cooley, that their mutual friend, Matthew Benton, just died from a heart attack. Prentiss had not seen either man in several years, both for different reasons. John also mentions that Matthew thought he was going to be killed just like "Tommy V." In searching, Garcia does find someone matching that name in the area who recently died from dehydration. There are similarities between the two deaths but no medical rationale for tying the two together as murders. A third person in the area then dies in a similar way but again no medical indication of an unnatural death or rationale tying the death to the first two. However, Prentiss and Rossi, in particular within the team, are certain the three deaths are related and that they are indeed murders. They have to tread lightly and carefully since the families of the deceased refuse to speak to the FBI - especially Matthew's family who know, and do not like, Prentiss - and since there is no official case as the police have not sanctioned one. The investigation gets more complicated for the team when they find who they believe is the murderer.

After being inactive for 10 years, Hotch's first BAU case, an elusive serial killer known as the Reaper, starts killing again.

When the kill count of a mass-murdering arsonist active in a small town reaches 31, the BAU are called in.

An AMBER alert is activated for a young boy in Cherry Hill, New Jersey and the BAU suspect it to be the work of a pedophile who has abducted and killed two other boys.

The team tracks down a highly obsessive-compulsive killer who targets blonde women and leaves messages to the police asking them to stop him.

A serial killer in Bend, Oregon is deliberately killing people by running them over with his car.

The BAU co-work with the U.S. Army to find the perpetrator behind an anthrax attack on a park in Annapolis, Maryland.

The team head to Canada to investigate the disappearances of a number of homeless people, drug users and sex workers and uncover something horrific.