Two serial killers send the BAU to St. Louis, and a new team member reports for duty.

When a bomb is found at what was thought to be a drug lab the BAU is brought in, and while Hotch conducts a state-side investigation Gideon matches wits with a prisoner at Guantánamo Bay.

A young man seeks out Reid for help regarding his fantasies of killing prostitutes, just as a serial killer starts brutalizing prostitutes near the capitol.

Derek is arrested as a serial killer, and the team must delve into his secrets in order to free him.

Gideon matches wits against the most prolific serial killer ever found, and the results are surprising.

The slaughter of a wealthy couple just after a Super Bowl party puts the BAU on the trail of two killers.

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.

As the city is on high alert, the team begins to believe that they have made a mistake with the profile and that everything the terrorists have done so far may in fact just have been diversion for something even bigger.

On the anniversary of a serial killer's execution, a murder spree which appears to be connected to him begins and the team must try and understand his mind in order to stop it.

Reid and Prentiss, having gone undercover into an underground cult to investigate child abuse, get trapped inside the compound when a federal raid on it goes bad.

A serial killer targeting couples stages their bodies in a way to make their deaths look like car accidents.

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.

A high priced call girl that is killing her clients must be found and stopped.

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.

Male college students on spring break are being raped and murdered, presumably by a man and a woman working together. The BAU are called in and suspect a shy hotel cleaner and a receptionist.

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.

A man is threatening to kill a doctor's son and is killing a man a day until he is successful. Meanwhile, Hotch's absence is noticed by Prentiss.

Darrin Call, a psychotic, suffers a breakdown in a pharmacy in Kentucky and stabs 3 people to death before running off and the BAU are called in to catch him.

A hitman targeting people in some way guilty of children-related crimes brings the BAU to Rossi's home town.

The BAU go after a pack of killers who mercilessly beat their victims to death simply for the thrill of violence.

The team hunts a suspect who impregnates young women and has them give birth before murdering them.

The BAU team tracks a serial killer who takes the eyes of his victims.

The BAU team follows a trail of murders that seems to align with the tour schedule of a rock star.

While tracking a family annihilator, the BAU must seek advice from "The Fox," one of the most horrific killers from the team's past who has an ominous message for Agent Hotchner.

The BAU team races to help Hotchner find The Reaper and save his family before it's too late.

While Agent Hotchner takes a leave of absence from the BAU, the team must regroup to solve a home invasion case.

The BAU must profile a criminal's past in order to catch him after he escapes from custody and begins a killing spree.

An unusual personal obsession is at the center of a BAU abduction case. Meanwhile, Hotch struggles with his return to work.

A rash of startling teen suicides in a small Wyoming town is the focus of a BAU investigation.

The BAU follows the mental decline of a con artist whose schemes have become so complicated that he begins to eliminate the people involved in them.

A serial killer who targets random victims in highly visible places to create a sense of public fear is the subject of a BAU investigation.

The BAU profiles a child abductor who may have been keeping children for more than eight years.

The relatively new Highway Serial Killer Database reveals an interstate serial killer who abducts then strangles women without sexually assaulting them.

The BAU team travels to San Francisco to investigate the murders of several homeless men and teams up with a separate group of BAU operatives who are working another case they think is connected.

The BAU team heads to Texas to track a serial killer targeting illegal immigrants attempting to make safe passage into the U.S..

The BAU team must profile a serial killer covered in tattoos, who commits suicide but leaves clues to the whereabouts of his last victim.

The team, including Garcia, go to the small town of Franklin, Alaska, to catch a rapidly escalating serial killer before the locals take justice into their own hands.

A serial killer in Boise, Idaho, is revealed to have been posting his murders on the Internet, accumulating quite a collection of fans in the process.

The BAU is called to California when a sadistic serial killer appears and begins killing people in the dark during the rolling blackouts.

As The Prince of Darkness continues his murderous rampage across California, the BAU go after him to save Detective Spicer's daughter from him.

While trying to get two suspects to reveal what they've done with a missing woman, the BAU brace themselves for the loss of one of their own.

When several women are found murdered in a similar fashion, Rossi revisits a case that has haunted him for 25 years.

The BAU team searches for a serial killer who is preying on married couples. Also, Hotchner looks to one of the team to fill JJ's vacant role.

The BAU team is on the trail of a serial killer targeting families throughout the Midwest. Meanwhile, Morgan is concerned when Ellie runs away from her foster family and pays him a visit.

The BAU go to Detroit to catch a man who burns his victims alive during the pre-Halloween celebration Devil's Night.

When bodies begin turning up in the cornfields of Indiana, the team must catch a pack of serial killers targeting exotic dancers.

The team hunts a serial killer after a kidnapped woman is found murdered in an alley with her lips cut off.

When a boy is found murdered on the Appalachian Trail, the BAU team goes deep into its forests in search of a man lurking in the wilderness who is targeting children.

The team searches a gated community for a killer who has strangled several women.

Morgan regrets his decision that a prisoner is ready for parole when the man murders someone days after being released.

While the BAU are in Miami investigating a series of bizarre ritualistic murders, Reid suffers from intense migraines which makes him concerned about his health.

While the BAU chases a pair of young lovers on an interstate killing spree, Prentiss is contacted by an old friend with some bad news.

The BAU travels to Los Angeles to investigate unusual murders throughout the city. Also, more of Prentiss' mysterious past comes to light.

The team travels to upstate New York to investigate a series of mysterious disappearances.

The BAU are called to Louisiana to get information from an autistic boy who has witnessed his parents' abduction. Meanwhile, Prentiss calls in two old colleagues to track down Ian Doyle.

When a series of killings occur on the BAU's home turf, Prentiss realizes that Ian Doyle is responsible.

While Prentiss has gone missing to track down Ian Doyle and finish him, her team attempts to track down her and digs deeper into her past.

The BAU team is at a crossroads as they are questioned by a Senate Committee for their retaliatory actions in the wake of Prentiss' loss, but an unexpected familiar face could help them win their case and keep the team together.

The BAU team searches rural Oklahoma when women are found murdered after being robbed of one of their five senses. Also, JJ and Prentiss get the cold shoulder from Reid as he deals with their deception about Prentiss' presumed death.

The BAU team investigates a mass murder at an Internet security company in Charlottesville, Va., but clues reveal it is not a typical serial killer at work. Also, Prentiss must complete recertification training under Morgan's watchful eye.

The team travel to Boise,Idaho where a serial killer is murdering the survivors of a high school massacre that took place exactly ten years earlier.

The BAU team investigates the abductions of young children with troubled mothers in St. Louis. Also, Rossi reconnects with his first wife who has shocking news for him.

The BAU search California's Angeles National Forest after a number of bodies mysteriously turn up in the mountain lakes there. Also, Rossi struggles with an agonizing decision regarding his ex-wife.

When a series of tornadoes hits Kansas, the BAU is called in to investigate bodies of young boys that turn up in the aftermath of the storms. Also, work pressures cause tension on JJ's home front.

Penelope calls in the BAU when a grieving member of an emotional support group that she heads abruptly vanishes at the end of a meeting.

The BAU team looks into the real reasons behind an apparent mass suicide of a small group of youths at a military academy. Also, Hotch and Morgan butt heads when a team member could be in jeopardy.

The team investigates a string of brutal bludgeonings in Philadelphia, leading to the city's boxing scene in search of the killer. Hotch makes a connection with an attractive runner as they both train for a triathlon.

The BAU is called to San Francisco to investigate a possible Zodiac Killer copycat. Meanwhile, Reid wonders what he's done in his life as he reaches 30.

The BAU team searches for a serial rapist in Houston known as "The Piano Man" who has resurfaced and is assaulting his previous victims. Also, Prentiss tries to come to terms with her trauma from last year and with rejoining the team.

A chronic gambler stumbles upon a sure-fire method for manufacturing luck - murder and the number eight.

The BAU team hit choppy waters on the beaches of Southern California when they discover a series of bodies hidden in lifeguard towers along the coast.

The BAU team investigates a series of brutal home invasions and murders in California's Inland Empire that appear to be gang-related, but their investigation may uncover a more sinister motivation.

The BAU heads to Atlanta, where stabbings of prostitutes lead the team to suspect more than one unsub.

When married couples fostering young children end up being killed in Seattle, the BAU team looks for an unsub with a maternal-yet-murderous instinct. Also, Garcia fears a possible proposition from Kevin.

A boy named Angel is found wandering in the desert, and when another boy turns up missing, the BAU searches for the kidnapper.

When an Oregon woman is found dead in an abandoned asylum, the BAU realizes that the victim is part of a series of gothic, ritualistic murders and the suspect might be a Satanist.

The BAU searches for Morgan's cousin in Chicago when his sister Desiree is injured in a car accident after chasing a car presumed to be carrying his cousin.

New deaths upon the heals of a serial killer's execution initially seem intent upon spreading doubt that the true killer met the bullets of the firing squad.

The BAU joins Agent Rossi as university guest lecturers, scheduled on the same day as Rossi's long-term annual commitment to visit an imprisoned serial killer.

In this first part of a two-part season finale, the BAU encounters a gang of bank-robbing serial killers in the nation's capital. As the team tries to negotiate the situation unfolding inside a bank, one of the team is taken hostage.

In part two of the season finale, the BAU races to understand the ultimate goal and core dynamic of the remaining Face Cards and their design in keeping Will captive and alive.

The BAU call Emily Prentiss for help to find JJ, who has been kidnapped. The truth about JJ and Cruz's past is revealed.

Former BAU team member and current Interpol Agent Emily Prentiss tracks an international serial killer to American soil and enlists the teams help to track him down. Meanwhile, the team deals with Morgan's departure.

The BAU welcomes back Emily Prentiss (Paget Brewster) as they are called upon to investigate the disappearance of three women

The BAU team searches for a serial killer along the Appalachian Trail in rural Virginia.

The BAU investigates the case of two murdered families where the oldest siblings are the sole survivors.

When three children disappear while riding their bikes on the same path as a similar unsolved disappearance 30 years ago, the BAU team comes in to investigate.

The BAU opens an investigation when a man arrives in town believing he's the brother of Dr. Tara Lewis.

The team heads to Yakima, Washington when the remains of a dozen people are found along a creek bed.

While Rossi conducts a profiling course on his birthday, he receives a call from his nemesis Tommy Yates, who discloses the location of his latest victim.

The team investigates a series of home invasions in San Diego involving casualties.

Reid has returned from Houston, where he was visiting his mother who is in a new facility on an experimental drug program. He is called back home from the office while the rest of the team heads off on their next case. It isn't until the team is in the air that they learn that Diana is no longer in the Houston facility, but that she is now living with Reid, as the trial drug was not having the intended effect. Reid had received professional advice that his mother should be in a facility both for her and his own good, but it may be news from a more caring rather than clinical voice which may carry more weight with him. Regardless, he makes himself available to the team, who are in the Tampa, Florida area where two individual deaths have occurred, both now considered murders, the two tied together by ink drawings on the inner arms of the victims, the second victim's whose has one more stroke of the pen than the first. The M.E. is able to determine that the markings were made with the same pen. The death of the first victim, a model suburban soccer mom, was initially ruled a suicide from an overdose of sleeping pills, her own prescription. The second victim, a homeless man, died of a heroin overdose, he who was known not to be a drug user, but rather an advocate for the homeless to get those in need into drug rehab programs. As such, they were both killed using the tools of their life, they presupposing that the unsub forced them to kill themselves. With two subsequent victims, the team also gathers more evidence: that the victims post-mortem were taken to outdoor sites with disturbed ground, and the unsub is connected in some way to fire. The identification of the ink markings in relation to the aspect of the disturbed ground may provide the key to finding where the unsub will strike next.

The BAU investigates the case of a killer who dismembered their victim before dumping just the torso.

When a member of the BAU gets in trouble in Mexico, they enlist the help of the International Response Team.

The BAU investigates a series of pedestrian deaths while a teammate's fate remains uncertain.

A series of acid attacks draw the BAU to Philadelphia, while Reid adjusts to a new reality.

A mother comes forward with information to help the BAU in their investigation of an unsub called the Bone Crusher.

The BAU suspects that two unsubs are operating at the same time when victims killed in different ways are found in the same city.

The BAU investigates an urban vampire who kidnaps his victims at night and holds them underground in the sewer system; Reid makes a difficult decision in prison.

Three victims are found tied to stakes in the Arizona desert.

The BAU investigates when several federal government employees, including a close friend of Walker's, succumb to symptoms of a heart attack; Reid anxiously awaits his trial date.

When Reid fears his mother has been abducted, he asks the BAU to investigate while he's stuck in prison.

Derek Morgan brings the BAU a lead in the case against serial killer and escaped convict Mr. Scratch.

In the wake of a devastating attack, the BAU works with former International Response Team member Matthew Simmons to save one of their own from escaped serial killer Peter Lewis.

Following the final incident with Scratch, the team has been taking a mandatory break to decompress. In addition, Reid has gone through his reinstatement evaluation, he who has been conditionally reinstated without the possibility of negotiation on that condition. In their time off, there has been a backlog of cases. However, they depart to Naples, Florida on a case of some currency, as a female has just been discovered murdered, her body stuffed into an old suitcase and placed in a public location. She is the second victim, the first as of yet an unidentifiable Jane Doe whose body had decomposed beyond a state of visual identification. By the time the team lands in Naples, a third victim is discovered. Beyond the suitcase in a public locale, the other similarities between the two identified victims is gender, that they were strangled, and that the same old fashioned shade of lipstick had been smeared on their mouth area. The lipstick and the suitcases indicate that there is some vintage aspect to the unsub's psyche, and that a probable stressor is being abandoned by a female, probably the unsub's mother when he was a child. They also discover that both women were in the process of a romantic evening, friends who can attest that they were careful women not prone to reckless dating. JJ surmises that the unsub is able to lure his victims unwittingly using a Florence Nightingale complex, in that they are attracted to some "broken" aspect to his personality. It isn't until the first victim is identified that a tie between all three victims is discovered. By that time, the team believes that the unsub probably has an ultimate victim in mind, who they have to discover before she becomes an actual victim. In the process of the case, Reid will demonstrate, at least in this case, if the evaluation committee was correct in their concerns about him.

The BAU team members head to Detroit, Michigan where two men in two weeks have been discovered dead. Both were married, Caucasian, mildly successful professionals. Both were found in very public places hanging by a meat hook, naked and their private parts cut off pre-mortem. The authorities eventually receive a snuff movie of the second victim, Curtis Wyler, including the entire time it took him to bleed out to death. The team analyzes the video in order to find any clues as to the unsub's whereabouts. Garcia discovers that both men had been systematically withdrawing large sums of money from their bank accounts, small enough not to be questioned by the banks. In questioning the Wyler's wife, the team believes that both men were probably using the money for the services of an escort. What Garcia finds is that it is not an escort service, but rather an online dating site, Blue Siren, where members arrange their own meetings. Both victims had been involved with the same member, a woman with the online handle Dasha, who had recently discontinued her membership. The team is able to locate Dasha, who admits to her involvement with the victims, but does not know why anyone would want to kill them. She is concerned that the unsub may be after her. The unsub is after her, but not in the way that she anticipates.

The BAU investigates a workplace shooting committed by a state-of-the-art drone in Silicon Valley.

When Garcia experiences anxiety over a case that's personal to her from her past, Morgan visits to lend emotional support.

The BAU must find out what several missing women have in common to find them.

The team heads to Austin, Texas, where two women are abducted and disfigured, only to be located a day later with no recollection of what happened to them. A third emerges shortly after the team's arrival in Austin.

The BAU is called in to investigate when a criminal sensationalizes his crimes by giving the local media exclusive footage.

The BAU is called to investigate when two members of a conspiracy group in Roswell, N.M., perish in quick succession.

When a series of backyard pool homicides are reported in California, the BAU team searches for an UnSub with a puzzling past.

The BAU team's investigation into the home invasion and attempted homicide of a police chief's wife uncovers a world of secrets in a small town in Virginia.

The BAU is called to New York when several brutal casualties are reported in Central Park.

The BAU is called to investigate a series of D.C. homicides where cryptic messages are found inside the mouths of each victim.

The BAU is called when the New Orleans P.D. discovers a mass grave inside a vandalized above-ground crypt in a local cemetery.

The FBI's assistant director of national security, Linda Barnes, joins the BAU as they investigate a quadruple homicide of a group of roommates in St. Louis.

Away from the watchful eye of the FBI's assistant director of national security, Linda Barnes, the BAU meets in secret to investigate an UnSub who appears to be kidnapping and photographing young women.

The BAU is called to Oklahoma to investigate a murderous clown terrorizing the sleepy town of Guymon.

The BAU travels to Chicago to investigate an unsub who leaves red roses on each victim. Also, Rossi gets an unexpected visit from his ex-wife, Krystall Richards.

The BAU takes charge of a hostage situation at a law firm in D.C., where Matt Simmons' wife, Kristy, works.

The BAU is called to investigate a series of deaths in Virginia suspected by the Center for Disease Control to be caused by bio-terrorism; Garcia visits her stepbrother to take care of a family issue.

The BAU is called to Taos, N.M. to investigate an UnSub who is targeting his victims' temporal lobes.

When Reid discovers former FBI Special Agent Owen Quinn locked inside a storage unit, the BAU questions the credibility of Quinn's bizarre accounts of searching for an UnSub that he named "The Strangler".

Penelope is the victim of an abduction.

When the mummified remains of numerous victims are found in the walls of an elderly couple's remote South Carolina home, Rossi, J.J., and Simmons are dispatched to track down a trail of clues that date back over 20 years. The hunt becomes urgent after BAU learns the killer has a specific ritual of when to strike, and like clockwork another person goes missing. Also, Rossi reconnects with his ex-wife, Krystall.

The BAU must determine what connects six people that each received a mysterious package in order to identify the Unsub. Also, Simmons and his wife Kristy must deal with their son, who got suspended from school.

Soon after the BAU steps in to help local law enforcement isolate a prime suspect for a ritualistic murder in Tallahassee, Fla., a second person who is related to the first victim is killed under similar circumstances. Also, Prentiss is concerned about Garcia's behavior in the aftermath of her abduction and has an idea of how to help with the healing process.

The BAU investigates a spooky local ghost story of the "Tall Man" and the clues it provides when two people go missing in the woods of East Allegheny's Dead Man's Conservatory, and a third mysteriously surfaces the following day with limited details as to what happened to her friends. To assist with the case, JJ reluctantly returns to her hometown, triggering emotional flashbacks to age 11 and her older sister's tragic death.

The BAU heads to Bethesda, Md., to investigate four murders in the span of three days along the eastern seaboard. The crimes become personal for Alvez, when the team discovers there are ties to his time spent five years ago working alongside the DEA and the Mexican police force in pursuit of the most notorious hitman in Mexico. Also, Alvez and his girlfriend, Lisa, decide to move in together.

It's a race against the clock for the BAU to capture the vigilantes behind a series of attacks taking place every 27 minutes in the nation's capital. Prentiss and Unit Chief Andrew Mendoza lead the effort to identify the Unsubs and what's motivating them.

The BAU investigates a double homicide and kidnapping in New Hampshire. Also, Rossi's plans to elevate his relationship with Krystall don't go as planned.

A professor from Lewis' past tips off the BAU to an alarming number of overdose deaths of patients who just completed rehab.

Prentiss plans a first date with Mendoza but the evening is cut short. Prentiss faces her past when the team investigates murders of businessmen who have had their hearts taken.

The BAU team heads to Portland, Ore., to investigate a chilling abduction that may be linked to a local couple killed in their home a week earlier.

Prentiss and the BAU team fly to Iowa to investigate the disappearance of three 10-year-old children who appear to have been abducted from their homes in the middle of the night, with surveillance video from a neighborhood park as their only lead to finding the children's whereabouts.

Rossi questions his actions in the aftermath of a near-death struggle with a serial killer who appears to have outsmarted the BAU.

The BAU leads the investigation into a string of murders taking place in supposedly haunted houses in Lewiston, Maine.

Wedding bells are ringing as Rossi prepares to marry Krystall. But first, the BAU team travels to Los Angeles to investigate a series of fatal shootings in broad daylight following car accidents.

The team search for multiple serial killers. One who removes women's faces and another who cuts up men's torsos. J.J. and Spencer are still reeling after her admission. J.J.'s life is put in danger.

JJ is in the hospital clinging to life having been seriously wounded in Everett Lynch and his daughter Grace Lynch's successful escape from custody. Besides Will, Reid is standing vigil at the hospital, he who is angry at himself for not realizing sooner that JJ was in trouble. If JJ doesn't make it, Reid will not only lose arguably his best friend, but he and she will not have been able to clear the air about the strain that has existed between the two of them since their previous case. Reid is also torn in two different directions emotionally as he is called by the facility where he recently moved his mother, they wanting him to come right away. With the Lynches, the team knows they they have disrupted Everett's plans - he a highly organized man - and thus Everett and Grace will be working on the fly. The team believes they have to find any connection that either Everett and/or Grace would have in the DC area for that support they need, including financial, to go off the grid. If Prentiss is able to speak to JJ about the shooting, they may get another piece to what is happening with Everett and Grace. Also working for them is the fact that they still have Roberta in custody, who, despite being a criminal in her own right, would probably want to protect Grace at all cost, perhaps even at Everett's expense.

The BAU investigates seemingly random fatal explosions throughout Kentucky and Tennessee.

The members of the BAU enjoy a Saturday off in vastly different ways. While Rossi and Prentiss help Simmons assemble a new crib, Garcia leads a hacking competition, and Dr. Reid strikes up a conversation with a woman named Maxine

Following a series of fatal shootings, the BAU team travels to Des Plaines, Ill to investigate what appears to be a copycat serial killer. There efforts are thrown off track when members of the BAU are targeted.

After a father and daughter get kidnapped, a former foe of the BAU returns with very specific demands for Dr. Reid that give a whole new meaning to the phrase "wheels up".

When the BAU team travels to Denver to investigate several murders, Prentiss is forced to evaluate her relationship with Special Agent Andrew Mendoza (Stephen Bishop).

Prentiss and J.J. decide about their future as the BAU goes to Beaumont, Texas, to investigate a series of killed businessmen.

It has been a year since Rossi nearly died at the hands of Everett Lynch, a.k.a. "The Chameleon," and he has developed some new theories, with inspiration from his former partner, Jason Gideon. The BAU team sets out on an epic hunt to capture Lynch.

Series Finale. Following an explosive face-to-face encounter with Everett Lynch, Dr. Reid suffers from a brain injury and, while experiencing hallucinations, is visited by ghosts from his past. Also, the BAU makes a shocking discovery about Lynch that affects Rossi personally, and the entire BAU team comes together to celebrate Rossi's retirement.

When a family annihilator abducts a teen girl, the BAU works the case on either side of the country to save her. But an unlikely connection to a mysterious kit leads to a bigger investigation and at the center of it is Penelope Garcia.

Team hunts an UnSub who severs spinal cords, and uncover a clue from their last case pointing to a serial killer network. To figure out how big this network is, Rossi must convince a reluctant Garcia to return to the BAU.

At the heart of the serial network is Elias Voit. Dangerous psychopath. Manipulative narcissist. Loving father and husband. The team must find all of his kill kits, but one is missing, and the path leads to a bomb in the capitol.

The BAU hunts for the next connection to the serial killer network when they pursue a home invasion team. Alvez and Garcia convince Tyler Green to submit to a cognitive interview to unlock his memories of Sicarius.

A surprising connection forces Dep. Dir. Bailey to ask the BAU to take a case involving young DC socialites bitten by a sadistic UnSub. When the case turns political, the BAU finds themselves in the crosshairs of a high-powered senator.

The aftermath of the explosion threatens to end the Sicarius case unless the BAU can justify a reason to keep it open. The hunt takes them to a death row inmate - but is he a killer or another one of Sicarius' victims?

With the fate of the Sicarius investigation hanging in the balance, the BAU takes a case in West Virginia, where an UnSub practices his own twisted form of Old Testament vengeance.

Voit's internal struggles with himself lead him to a desperate kidnapping. But Rossi's obsession brings the BAU closer to the truth than they've ever been.

Rossi will go to any lengths to prove that Elias Voit is Sicarius; Voit turns Rossi into his own worst enemy, putting his future at the BAU in jeopardy.

With Rossi in Voit's clutches, he grapples with the limits of his technical know-how and mental strength. As the BAU tightens their grip on Voit, he reveals just how far he's willing to take his deadly crusade.

While Prentiss has gone missing to track down Ian Doyle and finish him, her team attempts to track down her and digs deeper into her 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.

When a series of killings occur on the BAU's home turf, Prentiss realizes that Ian Doyle is responsible.

Former BAU team member and current Interpol Agent Emily Prentiss tracks an international serial killer to American soil and enlists the teams help to track him down. Meanwhile, the team deals with Morgan's departure.

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.

Prentiss plans a first date with Mendoza but the evening is cut short. Prentiss faces her past when the team investigates murders of businessmen who have had their hearts taken.

The BAU team searches for a serial rapist in Houston known as "The Piano Man" who has resurfaced and is assaulting his previous victims. Also, Prentiss tries to come to terms with her trauma from last year and with rejoining the team.

It's a race against the clock for the BAU to capture the vigilantes behind a series of attacks taking place every 27 minutes in the nation's capital. Prentiss and Unit Chief Andrew Mendoza lead the effort to identify the Unsubs and what's motivating them.

The BAU must profile a criminal's past in order to catch him after he escapes from custody and begins a killing spree.

Reid and Prentiss, having gone undercover into an underground cult to investigate child abuse, get trapped inside the compound when a federal raid on it goes bad.