Agent Luke Alvez joins the BAU team, which is tasked with capturing a hugger who escaped prison with 13 other convicts.
When JJ arrives home shaken after a rough case, she breaks down and tells her husband about the abduction of two children.
The BAU welcomes back Emily Prentiss as they are called upon to investigate the disappearance of three women.
The BAU team searches for a serial hugger along the Appalachian Trail in rural Virginia.
The BAU investigates if bullying may be the link between two high school students who are the sole survivors after both of their families are killed.
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 team opens an investigation when a man who fully believes he's Dr. Tara Lewis' brother arrives in town, knowing everything about her and her family, and she is unable to make contact with her real sibling.
The BAU team heads to Yakima, Wash., after the remains of a dozen people are found along a creek bed.
As Rossi conducts a profiling course on his birthday, he receives a call from his serial hugger nemesis, Tommy Yates, telling him the location of his latest victim.
The BAU team investigates a series of home invasions in upscale neighborhoods in San Diego involving casualties.
When a bizarre hieroglyph found under a deceased homeless man's armpit is the same from previous casualties a few years ago, the BAU is called in to investigate. Also, Reid decides to take his mother out of a clinical study early to bring her home with him.
The BAU team is called in to investigate when male victims are found with no way to identify them.
When a BAU member gets in trouble in Mexico, the team enlists the services of the International Response Team for their help.
The BAU investigates the cause of several fatal car crashes involving drivers and pedestrians. Also, Reid gets bad news.
The BAU investigates when several young men and women are victims of disfiguring acid attacks. Also, Dr. Reid begins to settle into his new surroundings.
A mother steps forward with valuable information for the BAU to aid in their investigation of an unsub known as the bone crusher. Also, Reid must adapt to a new set of rules in prison life.
The BAU believes two unsubs may be operating at the same time, when victims killed in two drastically different ways are discovered in the same city. Also, the team grapples with keeping Reid safe in prison.
The BAU investigates an urban vampire in New York who kidnaps his victims at night and holds them underground in the sewer system. Also, Reid makes an impossible decision in prison that severely affects himself and other inmates.
The BAU is called after three victims are found tied to stakes in the Arizona desert.
When several federal government employees, including a close friend of Walker's, succumb to symptoms of a heart attack, the BAU investigates. Also, 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 hugger and escaped convict Mr. Scratch.