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.

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

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.

Victims are kidnapped in Phoenix and forced to endure sleep deprivation. Meanwhile, JJ copes with exhaustion from juggling work and caring for her newborn son; and Hotch and Garcia deal with threats from the "Dirty Dozen," an underground hit man group.

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

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

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

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.

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

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

When former team member Prentiss tracks an international serial killer, she enlists the help of the BAU when she believes the UnSub's next victim will be on American soil.

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 guards at a Virginia prison intercept a package with evidence relating to the kidnapping of two boys several years ago, the BAU questions a notorious serial killer who may have information on the boys’ whereabouts.

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.