Hotch is apprehended for suspected conspiracy and the BAU suspects a larger plot may be brewing.

The BAU enters into a dangerous game of cat-and-mouse with a convicted serial killer after guards at a Virginia prison intercept a package with evidence relating to the kidnapping of two boys several years ago. The team believes the notorious killer may have information on the boys' whereabouts.

The BAU searches for an UnSub who is purposely disfiguring victims. Also, Rossi has an awkward reunion with his ex-wife, Hayden Montgomery, who kept his daughter, Joy, a secret from him for nearly 30 years.

When former BAU team member and current Interpol Agent Emily Prentiss tracks an international serial killer, she enlists the help of her friends at the BAU after she is convinced the UnSub's next victim is on American soil. Also, the BAU deals with Morgan's departure from the team.

When an UnSub targets the BAU, and the team goes into action to find out who is responsible.

The BAU heads to Wichita in search of an UnSub abducting children while their parents sleep. Also, Morgan tries to find who was responsible for his attack.

When Morgan is abducted, the BAU scrambles to find him and save his life.

Women are found dead inside their own homes throughout L.A. The BAU searches security footage for an UnSub who was invited into each victim's home.

When an 18-year-old girl escapes from a suburban home where she was held captive for years with two other women, the BAU searches for the UnSub who kidnapped them.

The BAU searches for a motive and an UnSub when victims are found in truck stop restrooms along highways throughout the South.

When bodies are discovered in public places throughout Boston, the BAU investigates whether a taxi or ride-share service the victims used before their deaths could lead the team to the UnSub.

The BAU implements an elaborate strategy to try and take down the "Dirty Dozen" hitmen ring, with Reid playing a central role.

The BAU searches for an UnSub who may be fascinated with medical experimentation.

After two undercover DEA agents are murdered and a third goes missing, the BAU joins the NSA to investigate whether an underground Internet drug syndicate is involved. Also, Hotch hopes the team's work with the NSA brings them closer to finding the "Dirty Dozen" hitmen ring.

The BAU hunts an UnSub in Phoenix who is kidnapping victims and depriving them of sleep. Also, Hotch and Garcia deal with the threat from the underground hitman group, the "Dirty Dozen,"

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.

When a woman is murdered in a small town in Florida inhabited entirely by sex offenders, the BAU faces a community full of suspects. Also, Lewis receives a career opportunity that may take her away from the BAU.

When the BAU investigates incidents of bodies being incorporated into macabre graffiti art in Detroit, they suspect an elusive-yet-notorious street artist could be the UnSub. Also, Dr. Lewis struggles to balance her relationship with her fiancé and her work.

When three restaurant workers are killed in a robbery/homicide in Las Vegas, N.M., the BAU looks at a cold case that happened in the town six years ago for leads.

When brides-to-be in Savannah are killed on the eve of their nuptials, the BAU suspects a jilted UnSub is at work.

When a Los Angeles bus is attacked with sarin gas, the BAU must act quickly to find the suspect before a larger-scale incident occurs.

The BAU searches for a serial killer who leaves distinctive marks on victims' faces with the help of an impressive potential new team member, forensic psychologist Dr. Tara Lewis: