NCIS

NCIS

Season 4 (2006)

The team investigates a political assassination carried out by Ziva's (Cote de Pablo) former Mossad partner; Gibbs comes out of retirement when Fornell (Joe Spano) and his daughter (Payton Spencer) are threatened; and a missing Navy lieutenant's car is found covered in blood.

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01. Shalom

Tony and the team try to prove Ziva had nothing to do with a political assassination carried out by her former Mossad partner - but have to tackle the case without Gibbs, who has retired to Mexico and now spends his time building boats. Naval crime drama, starring Cote de Pablo and Michael Weatherly.

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02. Escaped

Against his better judgement, Gibbs comes out of retirement to help Fornell and his daughter, whose lives are being threatened by an escaped convict. The team reopens the criminal's case and questions a former sailor, the only person to have contacted him while he was in jail. Starring Mark Harmon, David McCallum, Michael Weatherly and Pauley Perrette, with Hal Holbrook.

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03. Singled Out

A missing US Navy lieutenant's car is found covered in blood, and the team discovers she had been profiling men to find the perfect partner. When further investigations reveal she had planned to attend a seminar at a local hotel, Ziva goes undercover in a bid to find out more. Meanwhile, Jenny makes Tony a secret offer.

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04. Faking It

The shooting of a petty officer looks like an open-and-shut case when a Russian man is found with a recently fired gun in his car. However, the investigation takes a dramatic turn when it is revealed he is working as a spy for the Department of Homeland Security. Military crime drama, with Mark Harmon, Cote de Pablo and David McCallum.

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05. Dead And Unburied

The team investigates the murder of a lance corporal, whose body has been found in an empty house, and discovers he had a number of spurned lovers and a $2million inheritance. Ducky and Gibbs interview one of the dead marine's partners, but disagree over whether she is telling the truth. David McCallum and Mark Harmon star.

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06. Witch Hunt

Kidnappers strike on Halloween, wounding a marine sergeant and snatching his daughter - leaving the team members wondering why anyone would try to extort money from someone on such a modest salary. As the agents begin searching for a motive, Abby surprises everyone by turning up at the lab in a revealing fancy-dress costume.

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07. Sandblast

The team joins forces with military investigators to ascertain whether terrorists were responsible for an explosion at a golf course in which a marine colonel was killed. As inquiries proceed, McGee has to use his computer skills to break into secret government files to ensure the murderers are apprehended. Crime drama, starring Mark Harmon.

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08. Once A Hero

A former marine falls to his death from a hotel balcony, and investigations quickly lead to the discovery of another body. As Gibbs and the team dig deeper, they uncover evidence that points to the activities of a vice ring trafficking young girls. Mark Harmon, David McCallum, Michael Weatherly and Pauley Perrette star.

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09. Twisted Sister

McGee tries to help his sister, who believes she may have murdered someone - but is too traumatised and disorientated to remember exactly what happened. As the team investigates the connected case of a sailor's death, Tony and Abby find themselves distracted by relationship problems. Drama, starring Sean Murray, Michael Weatherly and Pauley Perrette.

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10. Smoked

Two FBI agents try to seize control of the team's investigation into the discovery of a perfectly preserved body hidden in a chimney at a marine base. Reluctant to be ousted from the case, Gibbs agrees to work with them - and learns the victim was a serial killer responsible for the deaths of 14 people. Meanwhile, McGee's literary efforts lead to discord with the others.

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11. Driven

The team tries to find out who was responsible for sabotaging a robotic vehicle that caused the death of a Navy lieutenant and almost killed Abby. Meanwhile, Ziva's suspicions are aroused by the discovery that Tony is repeatedly visiting the hospital. Drama, starring Pauley Perrette, Michael Weatherly, Cote de Pablo and Mark Harmon.

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12. Suspicion

The discovery of a dead marine intelligence officer in a motel room sets the team off on a hunt for her killer. Although the town's authorities have allegedly already investigated the crime, Gibbs is determined to conduct his own thorough inquiries - which may lead him to a terrorist cell. Drama, starring Mark Harmon.

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13. Sharif Returns

A marine major is found dead in an underground maintenance room, having scratched out one of his own eyes - and the presence of a webcam suggests someone watched him die. The team investigates with the help of Lt Col Hollis Mann, and links the case to wanted terrorist Mamoun Sharif, an old adversary who is threatening to unleash a chemical attack.

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14. Blowback

The agents try to track down an arms dealer who has the launch codes for the Navy's encrypted satellite defence system and is offering them to the highest bidder. In an attempt to win the confidence of the buyer, Ducky poses as an ageing Englishman trying to sell the information. Guest starring Armand Assante, with David McCallum and Mark Harmon.

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15. Friends & Lovers

A sailor's body is discovered in a disused restaurant, and his death is initially ascribed to an accidental drug overdose. However, Abby discovers a message written in blood on a laminated card found at the scene and realises he was murdered. Meanwhile, Jimmy continues to pursue a relationship with Agent Michelle Lee.

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16. Dead Man Walking

A nuclear power plant inspector suffers radiation poisoning, forcing the team to consider the possibility that a foreign power deliberately targeted him. As the others investigate, Ziva spends time with the ailing victim - and begins to realise she is developing feelings for him. Drama, guest starring Matthew Marsden, with Cote de Pablo.

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17. Skeletons

An explosion at a mausoleum exposes a number of freshly dismembered bodies, prompting the team to launch a multiple murder investigation to identify the victims. Meanwhile, Abby has a personal problem to deal with - and it seems Gibbs is the only person she will confide in. Drama, starring Pauley Perrette and Mark Harmon.

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18. Iceman

A supposedly dead marine suddenly regains consciousness on the autopsy table, leaving the team struggling to solve the mystery of how he came to be in such a strange predicament. Investigations reveal he had recently been on a trip to Baghdad - and uncover an unexpected link to Gibbs' past. Drama, starring Mark Harmon.

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19. Grace Period

The unit is tipped off about terrorist activity, and two agents are murdered during the ensuing investigation. Believing the information to be a set-up, the team tries to solve the case with assistance from a guilt-stricken Paula Cassidy, who holds herself responsible for the tragedy. Drama, starring Jessica Steen.

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20. Cover Story

McGee feels the pressure as the team investigates a double murder that appears to be inspired by his still unpublished new novel. His sense of guilt is compounded by the realisation that one of his colleagues could become the killer's third target. American drama following the work of the Naval Criminal Investigative Service, starring Sean Murray and Mark Harmon.

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21. Brothers In Arms

Director Jenny Shepard tries to solve the murder of an underworld source who was prepared to give information on the activities of arms dealer La Grenouille. Unfortunately her behaviour becomes increasingly obsessive as the case proceeds, leaving Gibbs wondering if her judgement is being clouded by a personal motivation. Starring Lauren Holly and Mark Harmon.

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22. In The Dark

A blind man unwittingly photographs evidence of a murder, leading Jethro and the team to the corpse of a petty officer who was stabbed with a knife left at the scene. Further evidence indicates his death was not the result of a random mugging - but cracking the case proves difficult. Meanwhile, Tony has relationship problems. Drama, starring Mark Harmon.

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23. Trojan Horse

Gibbs is made acting director while Jenny is attending an overseas conference. However, he decides to ignore his duties and investigate the murder of a man who arrived dead in a taxi at the team's headquarters with no clues to his identity - except a mysterious list of names. Drama, starring Mark Harmon and Sean Murray.

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24. Angel Of Death

Gibbs tries to find out why the agents are being forced by Homeland Security to take polygraph tests, while Tony and Jeanne are held hostage by a drug dealer. Elsewhere, Jenny returns from Europe to discover she has had a surprise visitor. Drama, starring Mark Harmon and Lauren Holly.

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