Morgan is arrested as a serial killer after he goes home to Chicago to visit his family. Because the detective making the arrest had used a profile provided by Gideon, the team travels to Chicago to help the local authorities find the real killer and exonerate Morgan.

When homeless persons begin going missing mysteriously from the streets in Kansas City, a local detective calls the BAU to investigate the disappearances.

After the contents of a self-storage unit purchased at an auction take the BAU to Philadelphia to investigate a series of murders, the local agent becomes the center of the case. To catch the killer, the team must profile the items inside the unit.

The BAU faces one of its toughest cases when the team is called to New York City to determine if a series of random shootings is the work of one serial killer or a team of killers working together.

A series of murders is linked to a serial killer executed a year earlier, and the BAU team must find the link between the dead killer and the new spate of crimes.

The BAU team hunts for a serial killer who targets members of the police department in Phoenix, Ariz., a case that hits close to home for Morgan, a former cop.

The BAU team tracks a serial killer who keeps the eyes of his victims as souvenirs.

The BAU team profiles a serial killer who uses the Internet as his hunting ground, bringing a whole meaning to the term "social networking".

When several women in Herndon, Virginia, are found murdered in a similar manner, SSA David Rossi reopens an unsolved cold case that has haunted him for a quarter of a century because he believes the original killer, who is suffering from Alzheimer's Disease, might have returned.

When an 8-year-old 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.

When the BAU is called to Florida after bodies are discovered buried in the ocean floor off the Jacksonville coast, the case hits home for Morgan because his aunt fears her missing daughter could be one of the victims.

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.

A series of murders in San Francisco bearing the tell-tale signs of the infamous Zodiac Killer have the BAU wondering if the notorious serial killer has returned. Also, Reid ponders if he should be doing more with his genius abilities.

As the BAU team continues to pursue the bank-robbing serial killers, the team determines that the suspects have a bigger target in the Nation's capital, and with one of the team still a hostage, they must work quickly to diffuse an explosive situation. Also, wedding bells ring for one of the BAU, and Prentiss ponders her future.

When a Texas prisoner escapes during a transfer, he leaves behind victims with his unique trademark, sewing their mouths shut, a signature the BAU remembers as unique to the UnSub "The Silencer." While they investigate who he was and who he's become, the BAU also gets to know the newest member of the team.

While Reid copes with a loss in his personal life, the rest of the BAU travels to San Francisco to investigate victims discovered in the Mission District.

The Replicator zeroes in on the BAU when the killer targets one of the team as the next victim. Also, the BAU is called in to investigate a string of deaths in Manhattan tied to apparent ecstasy overdoses, and Hotch discovers that his estranged brother, Sean, is caught in the middle.

The hunt for a methodical killer takes the BAU to Arizona to search for an increasingly devolving unsub, and the team speculates that Hotch is in the running to be the new BAU Section Chief following the death of Erin Strauss.

When the BAU is called to Kansas City to investigate a series of murders, a tense reunion ensues between Blake and her father, a retired police captain, and her brother, a detective, who must work together to help solve the crime.

The investigation in Texas reveals a deep web of corruption; Garcia must save a friend.

The BAU team investigates a series of murders in Bakersfield, Ca, which have left the victims unidentifiable. New agent Kate Callahan joins the BAU fold, and assists in the effort to solve the cases.

The BAU revisits its origins when they look at one of Rossi and Gideon’s old cases to track a killer that got away.

When a family of four is abducted while on vacation in Barbados, the BAU is called to assist Unit Chief Jack Garrett and his International Unit on their investigation. Garrett and his unit, the FBI's top division for handling cases involving Americans abroad, work jointly with Hotch and his team when they discover that this case matches one the BAU investigated last year in Florida.

When Kate's niece and her best friend Markayla are kidnapped, the BAU suspects an online predator engaged in sex trafficking who poses as a teenage boy.

The BAU is interviewing different candidates to join their ranks in the wake of Kate’s departure, including a forensic psychologist, Dr. Tara Lewis, who is eager to assist their efforts. Also, the BAU hunts for a serial killer who leaves behind distinctive evidence that points to someone intent on revenge.

The BAU helps Rossi’s journalist daughter, Joy, investigate the disappearance of a college student. Also, the team is alarmed when Giuseppe Montolo dies in prison after he warns Morgan about the “Dirty Dozen,” an underground group of hitmen, and JJ returns from maternity leave.

The BAU is shocked when Hotch is apprehended by a SWAT team and suspected of conspiracy, and as the team scrambles to prove his innocence, they suspect a larger plot is on the horizon.

Agent Luke Alvez (Adam Rodriguez) joins the BAU team, which is tasked with capturing a killer who escaped prison with 13 other convicts at the end of last season.

When a BAU member gets in trouble in Mexico, the team enlists the services of the International Response Team for their help.

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.

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

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".

When Reid and Garcia are abducted by Benjamin Merva, it's up to the rest of the team to find them. The BAU finds surprising clues in their own history to solve why the two heroes have been targeted by a mass murderer. It's a race to save them before a Believer's prophecy is fulfilled.

Prentiss faces her past when the BAU is sent to investigate the murders of prominent businessmen, all of whom are missing their hearts. Also, Prentiss plans a romantic first date with Mendoza, but the evening is cut short by an urgent call from Rossi.

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.

Following an explosive face-to-face encounter with Everett Lynch, a.k.a. “The Chameleon,” 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.

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.