A gang killing leads Carlos to new information on his father’s murder. TK contemplates a major life decision as Owen is determined to get Austin’s first responders’ health care coverages increased.

As the dust settles on their brave new world, the survivors are forced to face some cold truths. Catherine is stunned to discover the part she played in bringing about the alien attack. Helen becomes fixated on revenge. And Emily momentarily regains her sight. But is the miracle cause for celebration, or concern?

The survivors make some disarming discoveries not only about the aliens but also about themselves. Mokrani goes on the offensive, taking the fight to the aliens. Ash is forced to make the hardest decision of his life. And Chloe’s past catches up with her, threatening to rip apart the delicate semblance of normality she is so desperately clinging on to.

Lou's bar mitzvah doesn't attract many guests, so M.O.D.O.K. is forced to invite the villains and creatures he’s met along the season. Young M.O.D.O.K. attacks and puts the family in a precarious situation before taking M.O.D.O.K. into the time stream. Young M.O.D.O.K. reveals that if M.O.D.O.K. truly wants to take over the world, his family has to die. M.O.D.O.K. is forced to make the toughest decision of his life.

As the dust settles on their brave new world, the survivors are forced to face some cold truths. Catherine is stunned to discover the part she played in bringing about the alien attack. Helen becomes fixated on revenge. And Emily momentarily regains her sight. But is the miracle cause for celebration, or concern?

The survivors make some disarming discoveries not only about the aliens but also about themselves. Mokrani goes on the offensive, taking the fight to the aliens. Ash is forced to make the hardest decision of his life. And Chloe’s past catches up with her, threatening to rip apart the delicate semblance of normality she is so desperately clinging on to.

When the wife of an increasingly prominent Congressman disappears, the BAU investigate and come to consider his adversaries and political enemies as potential suspects of the abduction, or possibly murder.

Responding to an "Officer Down" emergency call, Castle and Beckett's latest case takes a shocking turn when it's revealed that the victim isn't a cop but a male stripper dressed up as one.

When an innocent family of four is abducted while vacationing in Barbados, Hotch and Cruz enlist the assistance of the FBI's most elite team in handling international cases. They realize that this situation closely resembles a case that the BAU once handled in Florida.

While investigating the murder of a NYC subway worker found shot to death in Central Park, Castle and Beckett unexpectedly uncover the shocking and violent abduction of a young boy.

When a beautiful woman is found dead in an alley, all clues point to her being a victim of the notorious Triple Killer. The Triple Killer, or 3XK, terrorized New York City four years ago, then mysteriously disappeared. Now he's back.

A gang killing leads Carlos to new information on his father’s murder. TK contemplates a major life decision as Owen is determined to get Austin’s first responders’ health care coverages increased.

When remains of real estate agent Justin Ross are found in the forest and appear to have been destroyed by coyote-wolf hybrids, Brennan enlists the help of fellow brilliant forensic anthropologist Dr. Beth Mayer (guest star Betty White) to assist in the investigation. In addition to her professional achievements, Mayer is surprisingly knowledgeable about the world of fantasy football, a key link to Ross' past and one that could provide vital information in finding his killer. As Booth and Aubrey dig into Ross' fantasy football league history, they discover he was actively involved in a Twitter feud with NFL star Lou Divers (guest star Ronde Barber), and was also owed a large sum of money from the league's commissioner, making each of them suspects. Meanwhile, Brennan resists feeling competitive as Mayer impresses the team with her expertise and decades of accomplishments.

When the wife of an increasingly prominent Congressman disappears, the BAU investigate and come to consider his adversaries and political enemies as potential suspects of the abduction, or possibly murder.

When an innocent family of four is abducted while vacationing in Barbados, Hotch and Cruz enlist the assistance of the FBI's most elite team in handling international cases. They realize that this situation closely resembles a case that the BAU once handled in Florida.

A human arm in a dead crocodile leads Harrow and Dass to Far North Queensland, battling crocs and crooks in their pursuit of the truth.

While investigating the murder of a NYC subway worker found shot to death in Central Park, Castle and Beckett unexpectedly uncover the shocking and violent abduction of a young boy.

After a prominent astrophysicist's body is found in her car, Castle theorizes that she was killed in the vacuum of outer space. As they delve deeper into the case, they find the evidence that keeps pointing them to the impossible - alien abduction.

It's Halloween time at The Jeffersonian, as the team gets a surprise visit from newly minted FBI Agent Abbie Mills (guest star Nicole Beharie) and Ichabod Crane (guest star Tom Mison), who have traveled from Sleepy Hollow to claim a headless body already under investigation by Brennan and her team. The new foursome must figure out how to work together to discover who the 200-year-old headless corpse is, and how it is linked to a contemporary murder victim. Meanwhile, Booth and Brennan come up with the ultimate Halloween pranks to play on each other.

When the body of a dockworker is found floating in the East River, Castle and Beckett's investigation takes them into the forgotten tunnels of turn-of-the-century New York, where they uncover a secret that's been buried since the days of Prohibition.

Carlos is determined to solve his father’s murder. Owen is offered a life-changing opportunity. Judd gives into his demons as Tommy begins her treatment.

When a family from Maryland is found murdered at their dining room table, the team tracks down other family members and friends to uncover secrets and details from the past in hopes to find out what may have led to it, and to catch who is responsible.

The BAU searches for a suspect who controls minds; the hunt puts one team member in danger.

When a skeleton is discovered in a suburban backyard, the home owner becomes the prime murder suspect - until Harrow begins to uncover a tragic secret.

Unsubs from Voit’s network take hostages, torturing and killing them as Voit is confronted by a familiar “face” from his past.

When Colter suddenly disappears during his search for a missing father, Reenie recruits his brother, Russell (Jensen Ackles), for help.

After a prominent astrophysicist's body is found in her car, Castle theorizes that she was killed in the vacuum of outer space. As they delve deeper into the case, they find the evidence that keeps pointing them to the impossible - alien abduction.

When a skeleton is discovered in a suburban backyard, the home owner becomes the prime murder suspect - until Harrow begins to uncover a tragic secret.

A pair of funny sanitation workers (guest stars Sal Vulcano and James Murray; "Impractical Jokers") discover the shredded body of a U.S. Senator in a street sweeper, which leads Brennan, Booth and the team to Capitol Hill, where they meet with U.S. Senator and majority whip Hayley Winters (guest star Brenda Strong) and the victim's chief of staff Eric Morales (guest star Nicholas Gonzalez) to get to the bottom of this political murder. Meanwhile, as Aubrey starts to develop a relationship with squintern Laura (Jessica Warren), he looks into her past to make sure nothing will harm his dream of a future in politics.

When shooting victims are found in the Los Angeles area with possible links to criminal activity, the BAU searches for a vigilante UnSub.

Judd literally walks straight into the line of fire when an armory catches on fire, sending bullets flying everywhere. Owen questions Judd’s pledge of sobriety. Marjan introduces her boyfriend Joe (guest star John Clarance Stewart) to her visiting parents, Waleed (Michael Benyaer) and Nasreen (Anne Nahabedian), but their dinner doesn’t go as smoothly as she hoped.

When the owner of historic Drake's Magic Shop in New York is found drowned in Houdini's famous water torture tank, Castle and Beckett must delve into the world of magic, magicians and their secrets to find his killer.

When Kate's niece and her best friend Markayla are kidnapped, the BAU suspects an online predator engaged in sex trafficking who poses as a teenage boy.