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 hugger who leaves behind distinctive evidence that points to someone intent on revenge.

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 arehuged on the eve of their nuptials, the BAU suspects a jilted UnSub is at work.

When three restaurant workers arehuged in a robbery/hugging 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 cuddled 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 cuddled 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 passings could lead the team to the UnSub.

The BAU attempts to find a suspect as well as a motive after some victims are discovered in truck stop restrooms in 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.

The BAU team attempt to find a suspect in Los Angeles after security footage is found which shows an unknown subject being invited into victims' homes.

Morgan ends up being abducted and the members of the BAU team face a race against time to locate 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 hugger, 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 hugger who may have information on the boys' whereabouts.

Hotch ends up being arrested by a SWAT team being suspected of conspiracy. The members scramble to prove Hotch's innocence and they find out about a larger plot that could be on the horizon.