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The NCIS team springs into action to find the assailant responsible for beating a Marine to death in his own backyard.
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A petty officer
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Gibbs and the NCIS team partner with a Coast Guard Investigative
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A Naval petty officer and sole witness in an upcoming murder trial disappears.
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Following a deadly attack, one member of the team reminisces.
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The team must protect Ziva's father when his attendance at a convention leads to surprises.
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Dinozzo's father (Robert Wagner) returns and plays an important role in a murder investigation.
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Summary: bby becomes fixated on solving a murder; DiNozzo's latest fling leads to an interesting Halloween.
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Summary: The team uncovers a sinister plan when a controversial DJ and a naval officer are shot to death.
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Summary: The team hopes to avoid an international incident when an American officer is killed on a British ship.
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Summary: The team investigates a bomb tech's guarded personal life after she is attacked.
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Summary: A girl's kidnapping turns into something bigger when her grandfather complicates the investigation.
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Summary: Gibbs must take desperate measures to protect his loved ones with Paloma Reynosa still on the loose.
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Summary: Gibbs heads to Mexico to face his demons and make a startling decision.
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Summary: When a colleague's murder sends shockwaves through the team, Gibbs uncovers a surprising link to the crime.
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Summary: The team tries to track down a serial killer, while Abby heads south of the border to give a speech with McGee in tow.
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Summary: DiNozzo finds himself increasingly captivated by a woman he's never met while investigating the murder of her brother.
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Summary: When an NCIS polygraph specialist's night job takes a dangerous turn, Gibbs, Fornell and the team have to uncover the truth.
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Summary: Gibbs ask Holly Snow to help them to investigate a murder in the world of professional call girls, what will cause troubles to the Team.
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Summary: The team and Coast Guard Investigative Services join forces when a Navy diver seeking sunken treasure is murdered.
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Summary: Gibbs and the team investigate the shooting of a Marine and uncovers more to his life than anyone would have ever imagined.
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Summary: Secrets arise when Gibbs former mother-in-law surfaces as a witness in a murder investigation.
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Summary: After one of the drivers of a shady shipping company is found dead, the NCIS team has to go on the road to take down the illegal activities along with the FBI.
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Summary: The team finds themselves in a race against time when a terrorist group threatens to detonate a "dirty bomb" in the D.C. area.
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Summary: While on the flight back from Paris, Tony and Ziva realize that their assignment to protect a government witness in an embezzlement case is in great danger when they learn that an assassin is located on the sam...
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Summary: Gibbs is worried about Tony's ability to handle his job when Tony's father turns out to be linked to their newest investigation, an assassination attempt on a foreign prince.
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Summary: While investigating a bizarre murder of a Navy pilot, the NCIS team butts heads with an attorney that has a grudge against Gibbs.
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Summary: The enlisted son of a retired colonel who became a preacher is found dead, and the team believes he was the victim of a hate crime. Meanwhile, Gibbs' father (Ralph Waite) visits, and Gibbs is perplexed by his u...
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Summary: When a death of a Marine leads the NCIS team to a government think thank with employed child prodigies, the team has to protect a 12-year-old child who may be the next target of the killer.
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Summary: The team needs to use other resources when an attempted robbery leads to the death of a Lieutenant and the entire city suffers a major blackout.
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Summary: With the team's help, Vance faces his demons while uncovering a complex relationship with a killer that puts his whole family in danger.
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Summary: A murder investigation prompts Gibbs and the team to play family counselor to his former mentor, Mike Franks, in the hopes of preventing a bloody international conflict.
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Summary: When a Marine known for his practical jokes is found dead on Halloween Eve, the NCIS team discovers that the victim's "good-natured" pranks may have inspired ghoulish retribution. Meanwhile, Ziva tries to adjus...
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Summary: The investigation of a Marine's death on foreign soil forces Ziva to confront her past.
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Summary: When a blogger that accused NCIS of a cover-up turns up dead, the NCIS team has to find out who killed him and take another look at the closed case.
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Summary: Gibbs is forced to dig into the past when a murder of a Marine and his two friends turns out to be linked to his team. Meanwhile, Gibbs faces a tough challenge as he holds Ziva's fate in his hands.
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Summary: With the past still left unresolved, the NCIS team must find a way to put it aside and concentrate on another investigation, but while looking for Ziva's replacement, the team comes to a stunning revelation.
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Summary: After Tony's confrontation with Rivkin, the NCIS team flies to Israel for a final showdown, where they aren't exactly welcome by Ziva's father, the head of Mossad. Gibbs has to make a tough choice as the situat...
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Summary: When an ICE agent is murdered after a security breach at the SecNav's residence, the NCIS team is forced to work with the FBI and the ICE in order to solve the murder. Meanwhile, Tony faces Rivkin.
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Summary: In Los Angeles, Gibbs and McGee continue working with the NCIS division in order to track a terrorist cell. Agent Callen goes undercover, while a psychologist uncovers the truth about the relationship between G...
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Summary: The team heads to LA to work with the team there to solve a murder investigation, which soon turns into something bigger.
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Summary: Abby has to take over a top secret government mission when their scientist goes missing, but soon realizes things may not be as they seem to be, while the rest of the team worries about Abby's safety.
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Summary: Gibbs has to put his personal feelings aside and work with Trent Kort who returns in order to track down a dangerous criminal.
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Summary: When a kid discovers a weapon that someone was killed with, the entire family ends up under investigation, as the NCIS team has to find out who was the last one that used the weapon and who got shot with it.
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Summary: The death of a boxer leads Vance to borrow the NCIS team and start investigating his death, while Gibbs digs into Vance's past.
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Summary: When a fellow agent is murdered, the NCIS teams heads into the desert to locate a woman who might hold the answer to the mystery murder.
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Summary: When one of Tony's old cases ends up re-opened, he switches roles with Gibbs to finally solve the crime.
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Summary: The NCIS team finds themselves involved in a city gang while investigating the death of a Marine, and Gibbs must face his past once again when he finds a message at the scene of the crime.
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Summary: The NCIS team investigates a bizarre murder of a sergeant whose suspicious private life might be the reason why he got killed.
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Summary: Secrets from Ducky's past are revealed when he ends up stabbed at the crime scene.
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Summary: The NCIS team must reveal the truth behind the murder of a jail guard which resulted in a prison riot and McGee being held captive by the inmates.
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Summary: During the week of Christmas, the NCIS team is working overtime searching for a prime suspect who turns out to have been dead for 17 years.
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Summary: While investigating the death of a petty officer in a car crash, the NCIS team learns of his violent secret life; underground street fighting.
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Summary: The team is forced to rely on information from questionable sources while trying to stop a criminal bent on stealing government secrets.
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Summary: A strange delivery in a box arrived at the Navy facilities: The delivery driver and a Navy MP officer discover it is a sailor's corpse.
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Summary: A Navy bank has undergone a hold. NCIS is responsible of the investigation. One of the new recruits assigned to the fraud unit, special agent Dwayne Wilson joins the team to help.
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Summary: The NCIS team is forced to investigate a crime during Halloween where a psychotic murderer leaves clues of its next victim's identity on the net.
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Summary: Gibbs' hunt for the killer of a marine puts him on a collision course with an old friend.
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Summary: A murder investigation takes the NCIS team back to Gibbs's hometown
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Summary: When Senator Patrick Kiley seeks Gibbs' help to solve the murder of a young Naval officer, the NCIS team find themselves pushed inside the world of Washington politics.
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Summary: DiNozzo's investigation into a Navy Lieutenant's apparent suicide takes a surprising and deadly turn when its seems that it might have a connection to a larger, deadly scheme.
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Summary: When a petty officer is found murdered, Gibbs learns about the mysterious connection between the disbanding of his team and the case.
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In the Season 4 finale, Mary's work interferes with Brandi's wedding when Mary is forced to look after her least favorite witnesses.
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Mary protects a courtesan from a gangster, who's the father of her unborn child. While Mary gets a crash course in childbirth, she must also decide if she can trust the woman.
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Mary protects a deeply remorseful Army veteran and clashes with his military lawyer. Adding to her worries is a visit from her ex-husband.
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Marshall and Stan contend with a rock-star witness and her controlling mother while Mary is away on a WITSEC-mandated road trip.
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A man is forced to enter WITSEC because of his twin brother's actions. Mary must protect them both from outside enemies and from each other.
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Mary counsels a divorcing couple in WITSEC in order to keep their family safe. To help her cause, Mary must learn about Hindu tradition in hopes of guiding the pair to work things out.
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Mary helps a terminally ill man reconnect with his estranged children
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Mary protects an Amish witness who must contend with culture shock and people who mean her harm
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Mary reluctantly teams up with a remorseless con artist to go after an even bigger criminal.
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Mary counsels a teenage pageant queen who discovers she has been unknowingly living under witness protection.
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A witness's romantic entanglements with a suspect fluster Mary, who acts as a go-between for the pair
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Mary helps a paranoid whistle-blower connect with his son
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Mary seeks help from a witness to help clear Brandi of grand theft auto charges in the Season 4 premiere
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After a priest witnesses the murder of a parishoner, he will have to give up his special vocation in order to enter WITSEC.
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Mary keeps an eye on a teen witness whose separated parents are too distracted by their own issues to pay attention to their daughter. Elsewhere, Marshall thinks a witness may have betrayed his brother; and Brandi tends ...
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Mary helps her latest witness, a homeless man who's struggling with the program, find his birth parents. But the search could cause more problems than she anticipated. Elsewhere, Scott asks to borrow more money, raising ...
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A witness with Asperger's refuses to testify against her friend, frustrating Mary. Elsewhere, Marshall and Stan try to prevent the deportation of a key witness, and Brandi comes clean about her investment plan w
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A woman wants to escape from her family, who are heavily involved in organized crime, but a secret from her past puts her eligibility for witness protection in jeopardy. In the face of these obstacles, she turns to Mary ...
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Marshall is being evaluated in the field by his father (Geoff Pierson) during a joint fugitive operation. Mary meets Brandi's secret friend.
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Mary's new witness is part of a mortgage fraud ring and is an important link in the case of FBI Agent Faber, whom Mary met a few episodes ago.
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Mary helps a paroled witness acclimate to life on the outside; Marshall helps out when one of Mary's witnesses becomes the victim of a revenge plot
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Mary's new witness falls in love for the first time; Mary must stop her witness from taking out his pain in the form of an explosive device.
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An FBI informant refuses Witsec protection and gets himself in a heap of trouble; Stan works with a witness suffering from pugilistic dementia
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A witness against a weapons trafficker wakes up from a three-year coma.
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In 2003 Mary meets Marshall for the first time as they get lovers CLAUDIA TOBIN and HENRY DOER into the WitSec program, and it's a toss-up whose relationship is going to last: Claudia and Henry's, or Mary and Marshall's....
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Mary's slow recovery doesn't hinder her determination to speedily track down the guy who shot her and bring him to justice.
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The U.S. government enlists WITSEC to hide one of Latin America's feistiest political activists, but everything goes south when the budding Evita moves to the bad part of town.
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When a Wall Street blue blood rats on his boss' investment fraud and hides out in WITSEC, something from his past life comes calling.
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A world-class counterfeiter witness is suspected in a murder; Mary and Marshall realize they may be hiding a witness from the government.
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Mary serves as technical advisor for a new training video; Marshall arranges to get one of Witsec's charter members, a former Philadelphia mobster, to his son's funeral.
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The barely legal daughter of Mary's witness, a Miami racketeer, is in a dangerous romance; Raph's mother visits to prepare an engagement feast for surprised Mary.
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After briefing a new witness, whose testimony is contingent on visitation rights with his son, Mary learns the son is missing and sets out to find him.
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FBI agent O'Connor arrests Brandi on charges of drug trafficking and murder. Insisting her sister is innocent, Mary works to help Brandi while ultimately trying to discover O'Connor's real motive for his actions.
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When a series of murders seem to follow a new ex-con witness, including stabbing Mary's friend, she and Marshall have to figure out if he's the killer in time to save his next victim.
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When a bridge collapses and plunges many to their death, the victim's families come after the engineer, who - once in Witsec - attempts to clear his name no matter what the consequence.
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When Stan's first witness turns up dead, with his badge amongst the bones, he becomes the Chief suspect - forcing Mary & Marshall to dig deeper into a 20-year old love triangle.
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A shady figure begins following Mary's newest witness.
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When a witness is trapped in a collapsed building, Mary must keep him alive while guarding him from his former partner, who may be targeting him from a nearby building. On the ground, Stan and Marshall must fend off a de...
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An irresponsible mother and her three children enter the program and Mary tries to straighten everything out. The eldest son is shown caring for the younger children at the beginning of the episode and this continues int...
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A northern California marijuana mastermind cannot testify without using the drug to neutralize his anxiety disorder.
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US Marshals Mary Shannon and Marshall Mann come back together to help another witness.
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Season 1 ends with Mary fearing for her job after Brandi's involvement with drug trafficking is revealed. Meanwhile, Stan and Marshall take on a special assignment.
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After watching her mother audition for "Sweet Charity" Mary is kidnapped; in New Jersey, Brandi's boyfriend Chuck is abducted and two FBI agents are killed; when federal agents suspect a connection, a nationwide manhunt ...
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Natasha, the Ukrainian accountant from the pilot episode, has new breasts and a new boyfriend, Serge. However, complications arise when she discovers he is also in the Witness Protection Program.
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Mary has a one night stand with a witness. Problems arise when he is accused of murder.
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A member of the Program under Mary's watch is in a car accident and Mary has to find out if it was an accident or related to his former life.
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The closeness of a family is tested when they enter the program after the daughter witnesses a shooting.
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In "," Mary learned that her very first witness, Chris Worley, is now an NCAA basketball star, but has a gambling problem that threatens to destroy the new life he and his brother spent 5 years building.
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Mary works to solve the mystery of who tried to kill her witness, an art dealer. To complicate matters, both his mistress and his wife are in the program…and key suspects.
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Mary and Marshall are caught in the cross-fire of a contract killer while transporting a particularly irritating witness.
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Mary's assignment this week is Treena Morris a con-artist who is married to a diamond smuggler. After she is arrested by the feds, she decides to tell all on her husband and his friends. While Mary is trying to keep he...
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Things get complicated when Mary takes on the case of Leo Billups. Leo saw his mother murdered and is going to testify against the people who killed her including his father.
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In the first episode we meet Mary Shannon a US Marshall for the Witness Protection Program. In this episode Mary tries to figure out what went wrong when a mobster's son who was under her protection is killed.
