SEASON 6
(2008 - 2009)


601. Last Man Standing
Gibbs is given the task of finding a mole inside his newly formed team. With the help of Agent McGee, Gibbs is able to trace phone calls between Lee and the dead Petty Officer. After verifying Agent Lee's logs of the calls she is cleared. Daniel Keating is focused on next and he is interrogated. During Keating's interrogation, shots are fired, and Lee is found to have shot Agent Langer, who Gibbs and Vance agree to have been the mole. At the end of the episode, McGee and Ziva rejoin Gibbs in the squad room while Agent Lee moves out and receives a text message saying, "Do They Suspect?", to which she replies "NO", showing her to be the mole instead of Langer.

602. Agent Afloat
While stationed on an aircraft carrier, DiNozzo discovers a Navy Lieutenant's apparent suicide may be connected to a larger, deadly scheme .

603. Capitol Offense
The NCIS team becomes entangled in the world of Washington politics when a distinguished Senator turns to Gibbs for help in solving the murder of a young, female Naval officer.

604. Heartland
After two Marines are ambushed, the NCIS team finds the investigation leads back to Gibbs' hometown, where secrets about his past are revealed and they meet up with Jackson Gibbs, Jethro's father, and two of his old enemies.

605. Nine Lives
The hunt for a marine's murderer puts Gibbs on a collision course with an old friend, FBI Agent Fornell.

606. Murder 2.0
During the week of Halloween, a murderous psychopath taunts the team by using the Internet to leave clues to the next victim's identity,

607. Collateral Damage
Gibbs second-guesses his own judgement when Vance assigns a rookie to aid his team's investigation into a deadly bank robbery.

608. Cloak
A top secret war game leads to very real consequences for a member of the team.

609. Dagger
The team must rely on information from some questionable individuals to stop a criminal bent on stealing government secrets.

610. Road Kill
After a petty officer dies in a car crash the team suspects foul play when their investigation leads them into the violent world of underground street fighting.

611. Silent Night
While stuck working on a case over Christmas the team searches for a suspect presumed dead...and begins to discover some startling personal revelations.

612. Caged
McGee is held captive in a women's prison after a guard's murder leads to a take over.

613. Broken Bird
After Ducky is stabbed at a crime scene, the team uncovers disturbing secrets from the good doctor's past.

614. Love and War
A slain captain's private life is on full display as the team must determine if a suspected act of treason lead to his death.

615. Deliverance
While investigating the death of a Marine, Gibbs and the team find themselves intertwined in an inner city gang war.

616. Bounce
Renny Grant, a man who DiNozzo put in jail for 3 years whilst Gibbs was in Mexico shows up after a witness testifying against Renny in court is killed, claiming he was innocent and that he could now prove it. Gibbs, sticking to his rules (Rule #38: Your case, your lead) gives DiNozzo leadership of the team for this case.

617. South by Southwest
The death of a NCIS agent leads Gibbs and Tony into the desert to locate a woman who holds the answer to the mystery.

618. Knockout
In Chicago, a former African-American boxer is murdered. The past is catching up with Vance... This man is an old friend of the NCIS director. In this episode, we discover the family of Leon Vance and his past as a boxer in Chicago. Leon will be assisted by part of Gibbs' team to make an informal investigation in Chicago. It will take him back to his past when he worked alongside a boss of organized crime, and try to find the murderer.

Gibbs' digs into Vance's past after the director borrows his team for an Investigation into a friends murder.

619. Hide and Seek
When a young boy finds a murder weapon, the team must trace ownership of the gun to find who used it last and who was murdered.

620. Dead Reckoning
Gibbs and the team must work with a shady Trent Kort to put away one of NCIS' most wanted.

621. Toxic
Abby encounters FBI agents after a visit to the dentist to make sure she doesn't have a cavity in the tooth she named Frank. Later the FBI recruits her to carry on a missing scientists work. Soon, Gibbs and the team uncover some news about the project that startles Abby and the team.

622. Legend, part 1
The body of a Marine leads Gibbs and McGee to the NCIS OSP division in Los Angeles, where a murder investigation quickly climbs to a matter of national security in which the two offices must work together to resolve. Meanwhile; Tony begins to snoop into Ziva's personal life.

623. Legend, part 2
With the appearance of Mossad agent Michael Rivkin, Tony is forced to question Ziva's loyalty to NCIS. Meanwhile, in Los Angeles, Special Agent Callen goes undercover to try to catch a terrorist cell while OSP psychologist Nate Getz discovers the startling truth about Gibbs and Special Agent Lara Macy's relationship.

624. Semper Fidelis
After a security breach at the SecNav's residence leads to the death of an ICE agent, Gibbs and the team are forced to work with ICE and the FBI to find his killer. Meanwhile, Tony finally comes face-to-face with Michael Rivkin.

625. Aliyah
Ziva's homecoming to Israel with Gibbs and the team is not a happy reunion with her father, the enigmatic and powerful head of Mossad. As tensions rise, Gibbs is forced to make a decision that sends shockwaves through NCIS.