When a Navy lieutenant on liberty dies of bubonic plague, NCIS Special Agent Tony DiNozzo helps the New Orleans team as they try to control a potential outbreak and find the source of the infectious disease.
The team investigates the death of a petty officer whom Pride had mentored Brody searches for a place to call home.
On the eve of his wedding to Rita -- and Connor leaving for the Witness Protection Program -- Pride must track down who attacked Jimmy and Connor, while he navigates Sasha's ulterior motives regarding her son.
Pride and Rita plan their wedding the FBI arrests Connor in connection to the bar's firebombing.
Pride directs the team to link Sasha to the recent attacks in New Orleans Carter and Tammy search for a stolen highly trained military dog Pride and Rita make an important decision about their wedding.
The team investigates the deadly bar bombing and impending criminal turf war involving Sasha Broussard Pride must come to terms with having Connor in his life Carter and Hannah work to define their new relationship.
When a torpedo hits a fishing trawler at sea, the entire Gulf Coast is in jeopardy as Pride and NCIS race to find the submarine before it can strike again.
A musician -- who created a controversial algorithm to generate hit songs -- helps the team investigate the murder of a music blogger Drew seeks help connecting with his son.
Three convicts -- including a brilliant hacker -- escape from prison Paige tries to manage Ralph's expectations when his dad returns.
After being accused of destroying a priceless piece of art, the team must pass a mandated psych evaluation Paige asks the team for help when Ralph is hesitant to go to the school Halloween party.
Walter and the team ask a troubled former associate for help when a nuclear reactor in Los Angeles is on the verge of a cataclysmic meltdown.
Steve and the team allow a talk-show host (Aisha Tyler) and her crew to follow them for a day, but a run-in with Wo Fat leads to danger.
McGarrett tells the story of his last mission in North Korea as he and Catherine cross into the country to retrieve a friend's remains.
The night before an election, the governor asks the team to investigate when a prostitute is found dead in a missing congressman's bed Danny waits for a custody decision.
When Chin is kidnapped and left in Halawa prison dressed as an inmate, he must escape before the other prisoners recognize him.
When a professor is murdered, his boss, his teaching assistant and a student all come under suspicion.
McGarret and Catherine meet a boy whose father is missing and could be in grave danger.
McGarrett and a little girl are taken hostage by an armed man (Tom Arnold) during a camping trip with Grace Kono meets Adam's brother, who was recently released from prison.
A botched robbery puts Max and his crush (Rumer Willis) in danger when a stalker targets a supermodel, Danny must come to her rescue.
McGarrett thinks a smart, seductive therapist (Vanessa Marcil) murdered one of her patients one of Doris' former targets seeks revenge.