Investigating a Secret Service agent’s death aboard Air Force One leads Gibbs and the others to uncover a terrorist’s scheme, and partners them up with another Secret Service agent, Kate Todd -- who may have longer ties with NCIS than any of them foresee.

When a marine corporal formerly known for his lucky streak violently parachutes to his death, the agents must look at the other men in his unit, as the case against an obvious suspect deteriorates.

After a dead Navy Commander washes up ashore, NCIS must investigate his possible link to two murdered drug runners nearby until evidence suggests that they were actually involved in a terrorist plot and the officer may have been – sadly – innocently caught in crossfire.

A seaman’s death points to his deluded involvement with a computer game that involves another shipmate, and could have deadly complications for everyone aboard.

A seaman’s death points to his deluded involvement with a computer game that involves another shipmate, and could have deadly complications for everyone aboard.

Two crewmen aboard a ship have overdosed on meth, but they both insist they do not use — and recent, random drug tests confirm their claims — so Gibbs, Tony and Kate board the carrier to unravel the mystery behind their critical condition.

An eco-terrorist cell has targeted a submarine with an inside job, and Gibbs and the others must determine which crewman is the cell’s plant – and halt his deadly plan.

A sailor’s death from ingesting emeralds leads the agents to Guantanamo Bay, where they must thwart a terrorist’s plot to kill one of his own.

A marine is killed on a covert CIA mission but shortly after his funeral, he apparently phones his wife, forcing NCIS to determine if his death -- or the call -- was a hoax.

The agents are called in to investigate when a woman who has been buried alive emerges from a shallow grave, with no memory of who she is, but certain a bomb is going to detonate soon on a Naval ship.

After a CIA employee unwittingly witnesses a murder via satellite and – after his anonymous tip -- the agents try to determine why a Navy Lieutenant was stabbed to death while testing a high-tech, classified device.

When a severed leg with a Semper Fi tattoo is discovered, the agents try to identify the body it belongs to… leading to a case involving another murdered marine from two years ago.

Sitting in a Washington, D.C. office on the job talking with two possible candidates, a Marine recruiter, Gunnery Sergeant Alvarez, is brutally taken out by a single gunshot that seems to come out of nowhere. As Gibbs (Mark Harmon ), Kate (Sasha Alexander ) and Ducky (David McCallum) arrive at the scene, they quickly assess that a sniper would be responsible. Kate peruses the files of past candidates that would be seeking vengeance on Alvarez – who had a penchant for over-promising to new recruits.

A Navy Lieutenant Commander Wade Julius is stripped, face down in the middle of a field by his abandoned car, apparently killed execution style after – the NCIS agents deduce -- a motorist with her car. As agents Gibbs, Kate, Tony (Michael Weatherly) and coroner Ducky investigate at the scene in a rural Virginia community, they meet the county’s Sheriff Charlene Dupray, who insists that they will have to share jurisdiction of the crime with her.

When Gibbs’ former commanding officer goes AWOL from Iraq, he must clear him of absconding with millions of Hussein’s found money - and murder – in the midst of the man’s insistence on uncovering a dangerous conspiracy.

As Ducky and his assistant Gerald prepare to perform an autopsy, a gun-toting terrorist emerges from a body bag to take them – and eventually Kate – hostage, leading Gibbs and Tony to determine the terrorist’s ties and thwart his efforts.

A petty officer’s death at an underground rave leads the agents into an investigation thatseems mired in confusion and points to possible kickbacks, a femme fatale, and practical jokes.

When an ex-Navy SEAL convicted of murdering his wife escapes from Leavenworth, the agents realize he has uncovered a shocking revelation and must track him down before he seeks deadly vengeance.

NCIS Agent Chris Pacci is found brutally murdered after-hours in an office building elevator, and Gibbs, Kate, Tony, and Ducky urgently begin work to find his killer. For Gibbs, Pacci’s death is soberly personal as Chris had tried to review a case with him the day before, but had said it could wait. The NCIS investigation first shows that Pacci had apparently re-opened a cold case, the death of Lieutenant Commander Voss. Voss’ body had been burned during a car accident three years ago as he was under investigation for credit card fraud and bilking the Navy out of millions as a supply officer at the Norfolk naval base. However, the money was never found, although clearly Pacci had a recent bead on its trail.

A marine going missing leads Gibbs, Tony and Kate to discover other men he served with have also been murdered, meaning an apparent serial killer targeting them is on the loose.

A marine’s gruesome death leads the agents to a marine base boxing ring, an agency sting, and his role in selling highly explosive assault weapons on the black market.

During a training exercise that is a prelude to a top-secret mission, a highly-respected Navy SEAL plummets off a cliff to his death and the agents have less than 48 hours to find his killer or the mission – which is imperative for national security – could be stalled.

Still obsessed with the Hamas operative who held some of his team hostage months ago, Gibbs is determined to catch the man… who re-surfaces in D.C. to kidnap Kate and hatch a plan to shoot down a helicopter carrying the President.