The BAU team is called in to investigate when male victims are found with no way to identify them.

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

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.

Voit awakens from his coma. The team finds videos from a dormant Sicarius Network killer called "The Zookeeper" indicating that the network has reactivated. With Voit still in recovery, the BAU must tackle this reawakened network on their own.

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.

When a series of backyard pool homicides are reported in California, the BAU team searches for an UnSub with a puzzling past.

The BAU is called to investigate a series of deaths in Virginia suspected by the Center for Disease Control to be caused by bio-terrorism; Garcia visits her stepbrother to take care of a family issue.

When the BAU team travels to Denver to investigate several murders, Prentiss is forced to evaluate her relationship with Special Agent Andrew Mendoza.

Prentiss and J.J. are faced with important decisions to make about their futures as the BAU travels to Beaumont, Texas to investigate a series of murdered businessmen.

Agent Prentiss has a personal connection to one of the victims in a series of deaths with religious overtones.

The BAU tries their luck in Atlantic City when the team is called in to investigate a series of ritualistic casino-related murders. Also, after a spat with her boyfriend, Kevin, Garcia thinks she and Morgan may have gotten a little too friendly with each other.

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

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 an UnSub in Miami sensationalizes his crimes by giving the local media exclusive footage, the BAU is called in to investigate.

The BAU is called to Taos, N.M. to investigate an UnSub who is targeting his victims' temporal lobes.

The BAU tries to get ahead of Jade and Damien who are on a killing spree. Rossi must confront an old flame to unpack the secrets behind the Gold Star program. Tyler and Rebecca attempt to gain leverage over Elias Voit's lawyer.

While Gideon is stuck at the office on crutches, the rest of the team travels to Tennessee to track down a killer who disembowels his victims and supposedly eats their organs.

Elizabeth Prentiss, a foreign ambassador and SSA Emily Prentiss' mother, seeks the aid of the BAU when a Russian immigrant is kidnapped and held for ransom.

An attendee at a popular motivational-speaker's conference in Seattle is murdered and the speaker himself disappears soon afterward. Meanwhile, Garcia is puzzled when Morgan refuses to attend a dinner honoring an old family friend.

The BAU is called to Wisconsin in search of a serial killer, and the team looks for a connection among the victims for clues to the UnSub. Also, Kate has trouble dealing with her niece, Meg, when she begins acting out.

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

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.

The BAU heads to Bethesda, Md., to investigate four murders in the span of three days along the eastern seaboard. The crimes become personal for Alvez, when the team discovers there are ties to his time spent five years ago working alongside the DEA and the Mexican police force in pursuit of the most notorious hitman in Mexico. Alvez and his girlfriend decide to move in together.

The BAU team travels to Mexico to aid in the capture of a serial killer who is targeting elderly women.