The sixth season of the police procedural drama NCIS premiered on September 23, 2008. The new NCIS Director Leon Vance became a regular cast character and Agent Gibbs' new team members were introduced: NCIS Agents Michelle Lee from Legal, Daniel Keating from Cybercrime, and Special Agent Brent Langer from the FBI. Langer was killed in the first episode of the season. After the end of the second episode, McGee, Ziva and Tony had returned to the team, while Lee and Keating were transferred back to Legal and Cybercrime respectively.
The two-part episode "Legend" introduced the team who would later go on to appear in the spin-off TV series NCIS: Los Angeles.
This is also the first DVD cover to feature Rocky Carroll who plays Leon Vance.
When a petty officer is found murdered, Gibbs learns about the mysterious connection between the disbanding of his team and the case.
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.
A distinguished senator asks Gibbs for help in solving the murder of a young female Naval officer.
When a murder investigation leads the team to Gibbs' hometown, secrets about his past are revealed.
Gibbs' hunt for the killer of a marine puts him on a collision course with an old friend.
During the week of Halloween, a murderous psychopath taunts the team by using the Internet to leave clues to the next victim's identity.
A Navy bank has been robbed. NCIS is responsible for the investigation. One of the new recruits assigned to the fraud unit, Special Agent Dwayne Wilson, joins the team to help.
A shocking revelation comes to light after the team is forced into playing a dangerous war game.
The team must rely on information from some questionable individuals to stop a criminal bent on stealing government secrets
The team investigates the death of a petty officer and discovers he may have been leading a violent secret life.
While stuck working on a case over Christmas, the team searches for a suspect presumed dead...and begins to discover some startling personal revelations.
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.
Secrets from Ducky's clandestine past come to the forefront after he's attacked at a crime scene. The team uncovers disturbing secrets from the good doctor's past.
The team discovers a link between a sergeant's murder and his possibly treasonous private life.
Demons of the past come back to haunt Gibbs when he finds a cryptic message waiting for him at a crime scene.
A murder prompts the reopening of one of Tony's old investigations, leading Gibbs and DiNozzo to reverse roles to solve the case.
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.
The death of a boxer leads Vance to borrow the NCIS team and start investigating his death, while Gibbs digs into Vance's past.
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.
Gibbs and the team must work with the shady Trent Kort to put away one of NCIS's most wanted.
When a government scientist goes missing, Abby is recruited to carry on his work, but the team worries that she may meet the same fate as her predecessor.
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.
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.
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.