The hunt for a methodical killer takes the BAU to Arizona to search for an increasingly devolving UnSub, and the team speculates that Hotch is in the running to be the new BAU unit chief, on the ninth season premiere.

As the BAU zeroes in on the suspect of the ritualistic killings they've been investigating in Arizona, a bizarre connection within the UnSub's family could lead them to finally nab the suspect.

When a sniper strikes Dallas, the BAU investigates whether the upcoming anniversary of the Kennedy assassination is a motivating factor or if something else is driving the UnSub.

The BAU meets their new section chief, Mateo Cruz, who, unbeknownst to them, shares a long work history with JJ. Cruz joins the team as they comb the streets of Baltimore for an UnSub who leaves victims unable to communicate.

As Hotch fights for his life due to complications from his stabbing at the hands of George Foyet, a.k.a. "The Reaper," he experiences visions of his late wife, Haley. Meanwhile, the BAU searches for a missing teenager.

When the BAU investigates victims of possible ritualistic murders in Utah, clues lead them to believe that the UnSub might have a fascination with the Salem Witch Trials. Garcia prepares for a "Day of the Dead" celebration.

After a series of strangulations in Boston, the BAU looks for an UnSub who likes to keep mementos of the victims, and the team wonders if a common link to the casualties could lead them to the culprit.

When teenagers reported missing are suspected of a series of mass murders in Chicago, the BAU investigates their whereabouts to find a motive for the crimes.

When skeletons are found in the backyard of a Virginia home, the BAU centers its investigation on the family living there, unearthing family secrets rooted in the past racial divisions in the South.

When a young boy goes missing from his home in St. Louis, the BAU reinvestigates a similar cold case to search for the UnSub.

The BAU is called to Kansas City to investigate a series of murders, a tense reunion ensues between Blake and her father, a retired police captain, and her brother, a detective, who must work together to help solve the crime.

When the BAU goes to San Jose to investigate a string of murders, Garcia delves into her hacker past and reconnects with her old flame to help the team with the case.

While the BAU looks for a vigilante killer on the loose in Cleveland, Rossi is concerned when his former Marine sergeant goes missing and heads to Los Angeles to find him.

When JJ is kidnapped, the BAU delves into her time at the State Department to find clues to her disappearance and uncover a secret mission that puts her life in danger. The team calls upon Prentiss to help in the crisis.

When the BAU investigates several murders in the Pittsburgh area, the team searches for a pair of UnSubs working as a team. Also, Garcia and Morgan share their Valentine's Day plans for their respective significant others.

When a 4-year-old girl goes missing while staying with a relative in Mississippi, the BAU uncovers some startling truths as the team races to find the child and bring her to safety.

Mysterious drowning deaths discovered in the Las Vegas desert have the BAU trying to figure out the true cause and motive for the murders.

When three bodies are found with bite marks in a shallow grave near Milwaukee, the BAU has questions to answer. Reid and Garcia work out for a company fitness test, but try to hide their preparation from Morgan.

As the BAU wraps up an investigation into unusual stabbings in Upstate New York, Morgan's visit with one of the crime's survivors could uncover more questions left for the team to answer.

When two murder victims are found in a backwoods community in West Virginia, the BAU uncovers a long-simmering feud between two families and must investigate which side could be responsible for the deaths.

A series of targeted kidnappings have the BAU searching for a commonality between the missing persons and a motive to lead to the UnSub. Savannah vents her frustration to Morgan about the amount of traveling he does.

When victims are found dead from poisoning in Calif., handwritten death threats have the BAU looking for an UnSub fascinated with Greek mythology. Hotch has concerns about participating in Jack's career day.

The BAU is called to Texas to consult on the murders of prostitutes. But as they delve further into the investigation, the team could put their lives at risk, on part one of the two-part ninth season finale.

The BAU continues its murder investigation in Texas, and clues uncover a web of corruption that could be the motive. One team member's life hangs in the balance on the conclusion of the two-part ninth season finale.