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.

Cracks start to show as the survivors find different ways to cope. Jonathan’s increasingly perturbed by Sacha’s strange behaviour. Emily proves to be an exciting conundrum for Bill. And Mokrani is horrified as his men delight in the opportunity to exact revenge.

The alien’s connection to certain survivors raises difficult questions. Bill makes a startling discovery. Sacha’s behaviour is increasingly erratic. And Tom’s birthday proves cause for celebration. But at what cost?

Cracks start to show as the survivors find different ways to cope. Jonathan’s increasingly perturbed by Sacha’s strange behaviour. Emily proves to be an exciting conundrum for Bill. And Mokrani is horrified as his men delight in the opportunity to exact revenge.

The alien’s connection to certain survivors raises difficult questions. Bill makes a startling discovery. Sacha’s behaviour is increasingly erratic. And Tom’s birthday proves cause for celebration. But at what cost?

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.

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.

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

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.

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

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.

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 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.

Castle and Beckett investigate the murder of a high-class matchmaker. In the meanwhile Castle's novel is being turned into a movie and the Hollywood actress Natalie goes to extremes in the character research, transforming herself into Beckett.

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 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.

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

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.

In an attempt to pay off Callan's debt, Fern sells drugs at a devil-themed party. Unfortunately a woman starts to hallucinate and throws herself off a balcony, plunging to her death. Meanwhile, Harrow believes he may be able to break the chain of evidence when Pavich orders the river bones be cremated.

R.J. is recruited by Emi to investigate the disappearance of a wealthy rehab tycoon's son; Mel and Catherine discover they have different views on parenting and finances.

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

Castle and Beckett investigate the murder of a high-class matchmaker. In the meanwhile Castle's novel is being turned into a movie and the Hollywood actress Natalie goes to extremes in the character research, transforming herself into Beckett.

In an attempt to pay off Callan's debt, Fern sells drugs at a devil-themed party. Unfortunately a woman starts to hallucinate and throws herself off a balcony, plunging to her death. Meanwhile, Harrow believes he may be able to break the chain of evidence when Pavich orders the river bones be cremated.

The team investigates the murder of an escape artist whose body is found in the woods. They discover that the victim worked at the Magic Palace, and had some secret activities in the works that might have made him enemies in the magic community. Meanwhile, Brennan and Booth poll their friends as to whether or not the tooth fairy should visit Christine, and Angela continues to work with Sebastian Kohl.

The BAU searches for a serial killer who leaves distinctive marks on victims' faces with the help of an impressive potential new team member, forensic psychologist Dr. Tara Lewis:

Owen makes a decision about his future; Tommy receives devastating news; T.K. and Carlos worry about adopting Jonah; Mateo gets his immigration status threatened after an altercation; a doomsday prepper gets trapped in a bomb shelter and The 126 and all of Austin brace for an asteroid crash.

The brutal murder of a lottery winner has Castle and Beckett up to their eyeballs in suspects. As the precinct buzzes with fantasies of what our cops would do if they won the lottery, Martha suddenly inherits money she feels she doesn not deserve.

When a Los Angeles bus is attacked with sarin gas, the BAU must act quickly to find the suspect before a larger-scale incident occurs.