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Terrorism shakes the foundations of the Navy and NCIS to such an extent that Gibbs and the team face surprises that will devastate them.
The team's search for a terrorist targeting the Navy takes a bizarre turn when a high-tech bug is found in Probationary Agent Ned Dorneget's tooth.
The NCIS team investigates a fire on a U.S. Navy ship which leads them to a revelation that threatens the security of all U.S. Navy facilities worldwide. Meanwhile, Tony and Ziva travel to Italy to investigate an explosive device that was found on a Navy ship.
Tony faces a boy from his past when missing classified Navy documents are found after a warehouse fire, prompting the NCIS team to join the Baltimore police department investigation.
Tony and Ziva travel to Colombia, where they are joined by Ziva's longtime mentor in the search for a missing Marine Lieutenant and Navy Chaplain.
A case hits close to home when the lead suspect in the murder of a petty officer is Director Vance's brother-in-law.
Following a leak of classified information, the Secretary of the Navy partners NCIS with PsyOps to solve the mysterious case.
When a Chief Petty Officer with top-secret clearance to a Naval research laboratory is murdered, the investigation leads the NCIS team to an international arms dealer. Meanwhile, a probationary agent tries to impress Gibbs hoping to join his team.
The team must investigate the apparent suicide of a Navy reservist with a high security clearance. Suicide is the apparent cause of his death, but is it the right one? Gibbs and Dr. Samantha Ryan of the PsyOps Division race to solve the mystery of the Navy reservist's death.
When a Navy captain is found dead and dressed in a weird costume under his uniform, the NCIS team comes upon a secret society consisting of real-life superheroes, and they have to track down the villain in the story with the help of Tony's ex-fiance.
While stopping by his usual diner for coffee, Gibbs finds himself in grave danger, prompting him to think about his past and the choices he made in his life.
The NCIS team investigates the murder of a Navy lieutenant commander while dealing with her distraught husband. Meanwhile, Ziva ponders the future when Ray returns.
While investigating the murder of a Navy Commander, the NCIS team finds out the whereabouts of Agent E.J. Barrett.
After a Navy Captain is murdered in his hotel room, the NCIS team has to find his pregnant companion and protect her from unknown assailants. Meanwhile, Jimmy brings his future father-in-law to work.
When Tony's father is found inside a car with a dead body in the trunk, the NCIS team has to find out if he is indeed guilty of murder, while the man himself has no memory of the night, and Tony is removed from the investigation but attempts to help prove that his father is innocent.moreless
The search into the disappearance of a Marine Lieutenant continues as the NCIS team tracks them down to Afghanistan. Meanwhile, Tony's deepest fear resurfaces and Gibbs has to go through memories of his past again.
While investigating a crash of a military plane that was transporting caskets, the NCIS team comes upon a discrepancy with the DNA remains.
When the husband of Gibbs' and Fornell's ex-wife is kidnapped, the NCIS team partners up with the FBI to investigate.
The NCIS team investigates the death of a Navy lieutenant that died of over-hydration, which soon turns into a murder investigation. Meanwhile, Gibbs meets Ducky's new lady.
While investigating the murder of a coast guard officer aboard an abandoned cargo vessel, the NCIS team finds a Lebanese family seeking refuge in the US. Meanwhile, Tony and McGee attempt to find the perfect woman for Gibbs.
When a contract killer murders a Navy Lieutenant Commander, the NCIS has to find out the motive behind it, and Abby learns valuable information about the case after going through a series of kidney donation tests.
The NCIS team has a surprise in store for them when investigating the murder of a Navy lieutenant leads them to McGee's grandmother.
The NCIS team investigates the death of a young Marine that came to his homecoming party with a stab wound.
Gibbs and the NCIS team have to find answers regarding Tony's months-long assignment when an NCIS agent is found dead.