"Future Perfect" -The BAU searches for an UnSub who may be fascinated with medical experimentation.

The crew races to a disaster at a wave pool, and an outbreak of mercury poisoning leaving its victims in a a zombie-like state; Owen must come to terms with his illness; Michelle follows a new lead on her missing sister.

With Richard's help, Catherine discovers she can travel to another world; a new revelation puts Martha's loyalties to the test; Zoe breaks Bill out of prison.

Tom grapples with a betrayal and encounters a familiar face; Catherine looks for a solution to the dangers of the black hole.

With Richard's help, Catherine discovers she can travel to another world; a new revelation puts Martha's loyalties to the test; Zoe breaks Bill out of prison.

Tom grapples with a betrayal and encounters a familiar face; Catherine looks for a solution to the dangers of the black hole.

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.

During the trial of a murdered socialite, a juror falls dead from cyanide poisoning. Suspect number one is the defendant of the trial, having an accomplice poison the juror's coffee within the courthouse.

The BAU hunts an UnSub in Phoenix who is kidnapping victims and depriving them of sleep. Also, Hotch and Garcia deal with the threat from the underground hitman group, the "Dirty Dozen".

When a reporter is found dead inside a pizza oven, Castle and Beckett try to determine why he was murdered. They hunt a trail of suspects working for franchises with very similar names.

Tara is visited by a ghost who helps her get to the root of her relationship issues.

Owen Strand, the lone survivor of his Manhattan firehouse on 9/11, takes his progressive philosophies of life and firefighting down to Austin, Texas, where he helps the firefighters of Firehouse 126 start anew.

The team investigates the murder of a police officer that sends shockwaves through both the Jeffersonian and FBI teams. Behavioral analyst Leslie Green (guest star Sara Rue) is assigned to work with Booth on the investigation and lends her professional assessments on who the cop killer could be.

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.

The BAU hunts an UnSub in Phoenix who is kidnapping victims and depriving them of sleep. Also, Hotch and Garcia deal with the threat from the underground hitman group, the "Dirty Dozen".

Nichols investigates Fern as a suspect in Quinn's murder while Dass tries to figure out how Harrow is involved. Meanwhile, Harrow investigates the death of a resident in a nursing home.

Tara is visited by a ghost who helps her get to the root of her relationship issues.

When a future Olympic swimmer is found dead in the pool, Castle and Beckett travel into the world of sports, drugs, and drug dealers.

Hodgins is eight weeks into his rehabilitation for his paralysis and forced to navigate life in a wheelchair. Meanwhile, Brennan and Booth investigate the death of a public defender who had multiple defendants from previous cases with motives to kill her.

Against orders, Beckett travels to Los Angeles while investigating the murder of her training officer Michael Royce, last seen being arrested in the Under the Gun episode; Castle questions Beckett's motives.

The crew races to a disaster at a wave pool, and an outbreak of mercury poisoning leaving its victims in a a zombie-like state; Owen must come to terms with his illness; Michelle follows a new lead on her missing sister.

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.

"Future Perfect" -The BAU searches for an UnSub who may be fascinated with medical experimentation.

A dead man wakes up on Harrow's autopsy table and promptly takes him hostage. Meanwhile, Dass pieces together clues from Quinn's murder and uncovers evidence that Harrow destroyed evidence, proof he was covering his tracks. Season Finale.

R.J. finds himself at the center of a suburban housewife murder mystery; Catherine worries that R.J. is getting too close to Emi.

Tara is visited by a ghost who helps her get to the root of her relationship issues.

When a future Olympic swimmer is found dead in the pool, Castle and Beckett travel into the world of sports, drugs, and drug dealers.

A dead man wakes up on Harrow's autopsy table and promptly takes him hostage. Meanwhile, Dass pieces together clues from Quinn's murder and uncovers evidence that Harrow destroyed evidence, proof he was covering his tracks. Season Finale.

The team investigates a body found in a car crash, the remains of which belong to a founder of a men's rights organisation who may have been the victim of domestic abuse.

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

Emergencies include an accident at a grain silo and a steak eating contest, plus an unusual home intruder; Owen helps Michelle uncover new information about her sister's disappearance.

An assassin with knowledge of the details behind Beckett's mother's murder escapes from custody during his trial, leaving Castle and Beckett to track him down. A secret is revealed about Captain Montgomery's past and the identity of the third cop.

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.