With NCIS headquarters damaged by the bomb. Gibbs goes on the hunt for Harper Dearing and to bring him down once and for all.

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 NCIS team analyzes what secrets could be in the hands of a terrorist targeting the Navy when a high-tech bug is found inside a probationary agent’s tooth. Meanwhile, the festivities for Jimmy Palmer’s upcoming wedding continue with the bachelor party.

The NCIS investigation of a fire on a Navy vessel reveals evidence that elevates security at all U.S. Navy facilities worldwide. Meanwhile, DiNozzo and Ziva travel to Italy when an explosive device is found hidden on a Navy ship.

After a warehouse fire reveals missing Navy documents, posing a potential threat to national security, the NCIS team joins the Baltimore P.D. investigation, reuniting Tony with a boy from his past.

Following the murder of a Marine, Tony and Ziva join Ziva’s longtime friend and mentor in Columbia in a search for a missing Marine Lieutenant and Navy Chaplain. Meanwhile, Jimmy Palmer decides who will be his best man.

A case hits close to home when the lead suspect in the murder of a petty officer is Director Vance’s brother-in-law.

The Secretary of the Navy partners Gibbs with Dr. Samantha Ryan after top secret information is leaked by someone on the inside.

Top-secret clearance from a Naval research laboratory is jeopardized when the murder of a Chief Petty Officer is connected to an international arms dealer. Meanwhile, Probationary Agent Ned Dorneget tries to butter up Gibbs in hopes of joining the team.

Gibbs clashes with Dr. Samantha Ryan (guest star Jamie Lee Curtis) over the truth behind a navy reservist’s possible suicide

When a Navy captain is found dead with an unusual costume hidden under his uniform, NCIS uncovers a secret society of real-life super heroes and must track down the villain.

During a routine stop for his morning coffee, Gibbs finds himself staring down the barrel of a gun, forcing him to question choices he has made in the past and present

When a Navy lieutenant commander is found dead in a building under construction, NCIS must search for a killer while dealing with interruptions from her distraught detective husband. Meanwhile, Ray’s return has Ziva thinking about her future.

The investigation into the murder of a Navy Commander leads the NCIS team to E.J. Barrett’s whereabouts.

When a Navy captain is killed in a hotel room, NCIS must track down and protect his very pregnant companion from unknown assailants. Meanwhile, Jimmy has problems of his own when he brings his future father-in-law to work.

After Anthony DiNozzo, Sr. is found in a car with a dead body in the trunk and no memory of the previous night, the NCIS team must figure out if he is capable of murder. Meanwhile, Tony is sidelined for this case and must go against orders to try and prove his father’s innocence.

As the NCIS team continues its search for a missing Marine, Gibbs and Ziva travel to her last known whereabouts in Afghanistan. Meanwhile, Tony reveals his deepest fears and Gibbs is forced to relive events from his past.

The NCIS team uncovers a discrepancy with DNA remains when investigating the crash of a military plane that had been transporting caskets.

The NCIS team searches for answers when the current husband of both Gibbs’s and Fornell’s ex-wife is suspiciously kidnapped.

An NCIS case changes from accidental death to murder when evidence reveals that a Navy lieutenant died of forced over-hydration. Meanwhile, Gibbs meets Ducky’s new love interest.

When a coast guard officer is gunned down on a cargo vessel, the NCIS team searches for the killer, but finds a Lebanese family seeking refuge on American soil.

Meanwhile, Tony and McGee try and find the perfect woman for Gibbs.

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander.

Meanwhile, Abby uncovers new information about her family after undergoing tests for a kidney donation.

The line between McGee’s personal and professional life is blurred when NCIS uncovers a connection between his grandmother and the murder of a Navy Lieutenant.

The NCIS team uncovers a startling surprise after a young Marine shows up to his homecoming party with a fatal stab wound.

Gibbs and the NCIS team have to find answers regarding Tony’s months-long assignment when an NCIS agent is found dead.

The lives of NCIS members are in jeopardy when they come face-to-face with the infamous Port-to-Port killer, on the eighth season finale of NCIS.

After new evidence reveals that the Port-to-Port killer has infiltrated the agency, the NCIS teams chase every lead in a race to track him down.

After Tony’s ex-partner, Danny Price, appears to be the Port-to-Port Killer’s latest victim, he revisits his days as a detective in Baltimore, including his first encounter with Gibbs.

The NCIS team tracks a Navy lieutenant’s killer after a Pentagon security camera reveals a petty officer committing the crime. Meanwhile, Gibbs announces that Agent Barrett and her team will take over the Port-to-Port serial killer case.

To Gibbs’ displeasure, Special Agent E.J. Barrett returns to lead the investigation of a seaman’s death that may be connected to a series of port-related murders. Meanwhile, Ziva finally introduces her boyfriend, Ray, to the team.

NCIS connects a message in blood left by a murdered Navy commander to a manuscript that may contain classified military information.

Gibbs questions Vance’s motives when he is asked to interrogate a teenage boy accused of killing his retired Marine father.

NCIS discovers that one of its former investigative assistants found brutally stabbed to death was selling details for how to rob a warehouse full of valuable possessions belonging to a woman convicted of fraud. Meanwhile, a new special agent joins the office.

The dismembered fingertips and teeth of a murdered Marine are discovered in the stolen purse of a pickpocketer, launching NCIS on a mission to find a cold-blooded killer.

A botched assassination attempt in Belgravia forces NCIS to protect the Defense Minister’s daughter, who is studying in the U.S. and smitten with McGee. Meanwhile, Gibbs investigates the death of the U.S. Marine who was killed in the bombing.

The NCIS team undergoes mandatory psych evaluations while investigating the death of a naval commander.

The NCIS team springs into action to find the assailant responsible for beating a Marine to death in his own backyard.

A petty officer’s recruitment session at a college fair comes to a fatal end, prompting the NCIS team, accompanied by Dr. Mallard’s predecessor, to solve his murder.

Gibbs and the NCIS team partner with a Coast Guard Investigative Service (CGIS) Agent to solve the murder of a Marine gunned down on a dinner boat.

The NCIS team investigates the disappearance of a Navy petty officer who is the sole witness in an upcoming murder trial.