Severide (Taylor Kinney) feels sidelined as he leaves Detective Lindsay (guest star Sophia Bush) and the Intelligence Unit to do their job and locate his sister Katie (guest star Brittany Curran). Shay (Lauren German) gets an unusual tip from Chicago Blackhawk players Brent Seabrook and Duncan Keith, who makes friends with Clarke (guest star Jeff Hephner) and stop by Molly's. Meanwhile, Casey (Jesse Spencer) learns more about his head injuries after another close call and Dawson (Monica Raymund) pushes hard to pass the physical test at the Academy.moreless
NCIS delves into the reasons behind an attack on a senator's daughter. Deeks partners up with Nell to back up Sam and Callen in their effort provide security for the daughter. One of Kensi's co-workers gives her the ideal holiday gift.moreless
The CSI team investigates when a man is found dead inside a human-sized hamster ball.
Nick and Hank investigate an ages-old feud that has erupted in Seattle, a feud that Nick and Monroe are well-acquainted with. Meanwhile, the death of a royal family member has repercussions across the world, and Monroe and Rosalee discuss the next step in their relationship.moreless
Emily puts her skills to work when there is an emergency in the house. An innocent becomes a victim and Duncan wants answers.
The team must stay fluid with an unsub who changes his pattern with each strike made in Detroit. Elsewhere, Blake faces a big decision when her husband returns to her life with a major career plan for her.moreless
When a Sara in crisis is accused of murder, it's race against time and a suspect from the past to clear her name.
While on doctor-ordered bed rest, Charlotte balances her pregnancy and her responsibilities at St. Ambrose Hospital but Mason is afraid she might never leave the hospital.
Adalind returns to Portland with revenge on her mind, while Renard tries to deal with his obsessive infatuation with Juliette.
As their investigation continues, evidence turns up that links the death to a group of Russian agents. Sam's deepest secret is at risk of coming out.
In the aftermath of Gemma's car accident, Clay and Nero have different approaches on how to help her out of trouble with Jax and Tara. The Sons try to find out who was behind the attack on Jax and Chibs. Meanwhile, Roosevelt promises to give Jax the member of the club that has been informing on them for the RICO case in exchange for Frankie Diamonds. Juice finally lets someone in on all of the secrets that he's been hiding from the club. And Jax devises a plan trap Clay, which involves manipulating his mother.moreless
The BAU is called to two crime scenes in Los Angeles and San Diego. Although the murders appear unrelated, the team's profile posits two unsubs working together in a deadly pact.
Michael is upset when he learns the truth about a secret that Cassandra kept from him, and he and Nikita travel to Moscow to confront her. Meanwhile, Alex makes one final attempt to track down her her mother by sending out a coded message through a televised interview.moreless
As the arrival of the 11th Pilgrimage draws closer, Lucas forces Skye to run a risky mission so he can complete his device ahead of schedule. However, his race to defeat his father brings about unwanted exposure and redemption of another citizen. Elsewhere, Maddy attempts to use Terra Nova's barter system when the core in her plex fails.moreless
Taylor and Mira fight in the jungle where Taylor learns more about the Sixers' plans as well as information about his son. They must ultimately work together against a prehistoric enemy. Jim receives some information on the Sixer mole and locks down Terra Nova while he tries to catch the traitor. Zoe's Ankylosaur is growing too large, which forces her to make a difficult decision.moreless
A joint CIA-NCIS operation gone wrong leaves an undercover Sam missing in Sudan, forcing Callen and the rest of the team to look for him before all is lost.
The BAU is called to rural Oklahoma when women are being murdered after being tortured with sulfuric acid. Meanwhile, Reid treats JJ and Prentiss with deliberate disregard as he tries to deal with their deception regarding Prentiss' fake death.moreless
A controversial and high-risk transplant arrives at the clinic thanks to an old friend of Ben's. Mina's new love interest arouses jealous feelings in Tommy.
It's close to Halloween, and a man is found murdered in a graveyard - with a stick through his heart, and sporting fangs. Castle and Beckett track the murderer to a vampire cult, all the while Castle is trying on costumes for his Halloween party - costume mandatory!moreless