When a mortar attack in Baghdad turns into a murder investigation, two members of the NCIS team are sent to Iraq to solve the case.
When the dead body of arms dealer La Grenouille surfaces, the NCIS team is put under investigation for his murder by the FBI and Jenny Shepard becomes the prime suspect.
When the NCIS team investigates a fatal dog mauling, Abby puts her career on the line to prove the dog's innocence in order to save his life. Meanwhile, Gibbs zeroes in on the secret Jenny is keeping.
When a high-tech naval radar goes missing, the NCIS team stakes out a warehouse to catch a suspected thief - but witnesses a murder instead. Meanwhile, Ducky keeps a secret from the team.
The NCIS team investigates when a Muslim Marine is found dead near a Mosque that is suspected by the FBI of terrorist recruitment. Their search is delayed when Ducky refuses to autopsy the Marine in deference to his family's religious beliefs.
The NCIS team pays a heavy price when they try to track down a Marine who believes he is still in Iraq. After a violent confrontation, the team realizes the Marine is the subject of a secret experiment.
The NCIS team plays babysitter to a 9-year-old boy whose father is wanted in connection with a cold case murder. Their search for the man, a trained survivalist, leads them into the wilderness where they discover the startling truth about his past.
The NCIS team's investigation into the assassination of a Navy Admiral takes an unexpected and emotional turn when they meet a woman searching for her missing husband, a political refugee from Africa.
When Gibbs agrees to help the childhood friend of his daughter, who died 15 years ago, he finds himself at the center of an emotional and soul searching journey into his past, which leads to a shocking and heart-stopping conclusion.
While investigating a mysterious death at sea, the NCIS team finds their own lives are in jeopardy. Gibbs and the team are called to investigate a mysterious death aboard a top-secret naval research ship in the middle of the ocean, only to discover an abandoned ship and a deadly secret that could cost them their lives.
Suicide turns to murder as the NCIS team attempts to talk to a naval officer out of jumping to his death. When the NCIS team is called in to talk a distraught naval officer from jumping off a rooftop, what starts out as an attempted suicide turns into a murder investigation for Gibbs and team.
When Ducky determines that one of his research cadavers was the victim of murder, the NCIS team uncovers a web of criminal intrigue. Gibbs and his team identify a cadaver, mistakenly tagged a "John Doe" as a career felon with ties to a criminal mastermind capable of erasing unsavory pasts.
Gibbs and Lt. Mann unite for a joint investigation into the murder of a Marine Captain who had access to highly classified information. Things become complicated for Gibbs when a witness in the case turns out to be his ex-wife.
Gibbs and the NCIS team's investigation takes a dramatic turn when the random murder of a Petty Officer turns into a search for a missing infant when Ducky makes a startling discover in autopsy.
The final showdown between the NCIS team and an elusive arms dealer reaches an explosive and deadly conclusion, on the fifth season premiere of NCIS. Secrets from last season are revealed.
All the secrets of Season 4 are answered in the thrilling fifth season of NCIS as Special Agent Tony DiNozzo's involvement with the daughter of an arms dealer reaches its explosive conclusion. DiNozzo isn't the only member of the team who will be forced to reveal long-held secrets, as both Director Jenny Shepard and Doctor "Ducky" Mallard face investigations that could ultimately destroy their careers. As for Special Agent Leroy Jethro Gibbs, the fifth season will begin with a heartbreaking journey that will lead to redemption and end in murder.
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