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As the bodies of two missing persons are found in a car trunk, and the BAU suspects that an interstate human trafficking ring is at work.
The BAU investigates bodies discovered buried in the ocean floor off Jacksonville, but the case rattles Morgan when his aunt suspects her missing daughter is one of the victims.
BAU is brought to a North Carolina mountain town to investigate a series of victims.
Indianapolis Colts star Dallas Clark guest stars as San Diego Police Officer Austin Kent, who assists the BAU as they hunt a stalker in San Diego who is killing college students.
As the BAU investigates targeted killings in Tampa, they also deal with their own feelings about the loss of Prentiss.
Morgan, Reid and the BAU travel to Portland to investigate a suspected gang of murderers targeting a new victim each night.
Prentiss is ready to confront her nemesis, Ian Doyle, once and for all. Meanwhile, the BAU calls upon JJ to help them find Prentiss and capture Doyle before it's too late.
Prentiss begins to feel the heat after Morgan and Prentiss assist in solving a series of suspicious murders that involves Prentiss old Interpol nemesis.
Reid makes a connection with an autistic child that could assist the BAU in finding the boy's missing parents. Prentiss enlists two former Interpol colleagues in hunting an old nemesis.
Morgan, Reid and the rest of the team study evidence when the BAU is called to upstate New York to investigate mysterious disappearances.
The BAU tracks a killer who is abducting women and killing them for their scent. It's as creepy and weird as it sounds.
The BAU hits the road to track down young lovers Sydney (Adrienne Palicki) and Ray (Jonathan Tucker) as the pair embark on an interstate murder spree.
Hotchner, Rossi and the team must check out victims and profile assailants when the BAU travels to Miami to investigate a series of bizarre, ritualistic murders.
Morgan suggests that a man has been rehabilitated and aids in his parole, but later regrets his decision when the man murders someone days after being released.
FBI cadet Ashley Seaver (Rachel Nichols) assists Reid, Prentiss, Hotchner, Rossi and Morganas they search inside a gated New Mexico community for a killer targeting women.
Rossi, Hotchner and the BAU go deep into the forests of the Appalachian Trail in search of a man lurking in the wilderness who is targeting children.
Garcia, Morgan and the team hunt for a killer when a kidnapped woman is found murdered in an alley in Georgetown and must find him before he can strike again.
In the Midwest, the BAU team searches for a pack of serial killers targeting exotic dancers after bodies begin turning up in the cornfields of Indiana.
The BAU team must find a killer who has struck Detroit for the past three years solely during the raucous pre-Halloween celebration Devil's Night.
The BAU tracks a families throughout the Midwest. Morgan is concerned when Ellie runs away from her foster family and pays him a visit.
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.
Several women in Herndon, Va., are found murdered in a similar manner. As a result, Rossi reopens an unsolved cold case that has haunted him for a quarter of a century.
On the second episode of the season, JJ tries to reunite a family whose daughter has mysteriously disappeared, all while she deals with a new job offer that she can not ignore.
The fifth-season cliffhanger concludes to kick off season six of "Criminal Minds." Our Darkest Hour has become "The Longest Night."