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

Rossi will go to any lengths to prove that Elias Voit is Sicarius. But Voit turns Rossi into his own worst enemy, putting his future at the BAU in jeopardy.

When the identity of the last Gold Star member is revealed, the pieces of the puzzle click together. Prentiss, now in mortal danger, must confront Jade and her accomplice to expose the truth behind the “conspiracy” before time runs out for the BAU.

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.

When Reid discovers former FBI Special Agent Owen Quinn locked inside a storage unit, the BAU questions the credibility of Quinn's bizarre accounts of searching for an UnSub that he named "The Strangler".

The BAU tracks a serial killer who chooses junkies, prostitutes and the homeless off the streets of Detroit as his victims and takes them across the border into Canada, and an agent's life is in peril.

The BAU team races to help Hotchner find The Reaper and save his family before it's too late.

A series of murders in San Francisco bearing the tell-tale signs of the infamous Zodiac Killer have the BAU wondering if the notorious serial killer has returned. Also, Reid ponders if he should be doing more with his genius abilities.

When three people implicated in murders claim they were attacked by a “clawed shadow monster” at the moment each crime occurred, the BAU searches for an UnSub who is controlling their minds. Also, the search for the culprit puts one of the team in jeopardy.

The team heads to Yakima, Washington when the remains of a dozen people are found along a creek bed.

Derek Morgan brings the BAU a lead in the case against serial killer and escaped convict Mr. Scratch.

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 investigates a workplace shooting committed by a state-of-the-art drone in Silicon Valley.

Morgan lends emotional support to Garcia when she experiences anxiety over a case that is personal to her from her past.

With Rossi in Voit’s clutches, he grapples with the limits of his technical know-how and mental strength. As the BAU tightens their grip on Voit, he reveals just how far he’s willing to take his deadly crusade.

When the prolific serial killer Frank returns and murders Gideon's girlfriend, Gideon takes off to find him without telling the team where he is going. The BAU must then profile Gideon as well as Frank to find both of them.

When a new type of chemical warfare is released into the open air, the BAU must act quickly to find the source before any more innocent people are exposed.

When Reid discovers that his girlfriend has been kidnapped by her stalker, he and the BAU team band together to find her before it's too late.

The investigation in Texas reveals a deep web of corruption; Garcia must save a friend.

BAU team investigates a series of home invasions in upscale neighborhoods in San Diego involving casualties.

Several women go missing in Virginia and the BAU must figure out what they all have in common in order to find them.

The BAU is called to Oklahoma to investigate a murderous clown terrorizing the sleepy town of Guymon.

The BAU takes charge of a hostage situation at a law firm in D.C., where Matt Simmons’ wife, Kristy works.

When bodies wash up on the Maryland shoreline, the BAU races to find the UnSub. After surviving a prison attack, Elias Voit has been placed in a medically induced coma while Rossi is investigated for the incident.

In this conclusion of a special two-part episode, finding the serial killer becomes critical to the BAU when the team realizes Reid is being held captive and a live feed of him being tortured is shown on the internet. Meanwhile, Reid's troubled childhood is revealed in flashback sequences as he drifts in and out of consciousness.