Gibbs calls on the team to assist DEA Agent Luis Mitchell with a case that keeps going cold, but DiNozzo discovers there is more to Gibbs’ personal connection to the agent and his desire to help him succeed.

After a Marine is found murdered in Quantico hours after calling Gibbs to discuss a possible case, Bishop and McGee go undercover as a married couple to run surveillance on a Marine Lieutenant and his wife.

Vance partners with Gibbs and returns to field duty when a murder case is connected to a former NCIS agent he locked up for stealing evidence.

While visiting a pharmaceutical lab on a murder case, Abby is trapped with no communication to the outside world after armed men take over the building and hold everyone hostage.

When a Petty Officer’s murder matches the M.O. of a local serial killer, the NCIS team must determine if this is the killer’s latest victim or the work of a copycat.

The NCIS murder case of a retired Navy Lieutenant Commander forces Ducky to reveal his participation in a secret society that solves cold cases.

DiNozzo is reunited with his ex-girlfriend, Jeanne Benoit, when insurgents in Sudan attack a group of volunteer doctors, including her husband.

In order to clear his name, a Petty Officer volunteers to be court-martialed if NCIS agrees to conduct its own investigation after his murder case is dismissed due to a mishandled warrant.

The Secretary of Defense calls on NCIS to help a sailor who is battling leukemia to locate a donor for a bone marrow transplant, after two of his siblings are killed in the line of duty.

After Ducky is attacked by a man claiming to have information about his half-brother who died decades ago, the NCIS team searches for the perpetrator.

The passengers and crew of a private plane traveling from New Orleans to Washington, D.C., are poisoned and the evidence points to Abby's brother, the aircraft's missing chef. The episode continues on NCIS: New Orleans S2E12 Sister City (II).

While investigating the murder of a seaman who was set to testify before a grand jury, the NCIS team uncovers the resurgence of an international human-trafficking ring.

Four deep sea divers stay inside a diving chamber with a deceased body in order to decompress. The dead body belongs to a retired Petty Officer who died in mysterious circumstances.

When Secretary of the Navy Sarah Porter learns her daughter has been kidnapped, the NCIS team partners with the FBI to track the case, determine a motive and bring her home.

Doctor Cyril Taft experiences the rush of an NCIS case after he is assigned surgical duty to Gibbs’ suspect and finds key evidence.

The NCIS agents’ personal plans are interrupted when each of them catches errors in a seemingly cut-and-dried case.

The NCIS team re-examines an ambush on a group of Special Ops snipers in Iraq after an American couple is attacked in the same area six months later.

A Navy Public Affairs officer is murdered, and the victim's wife and mistress accuse each other of the crime.

Tony's identity is stolen by multiple perpetrators who go on to blackmail politicians.

Gibbs and Senior FBI Agent T.C. Fornell unite after two British prisoners, including a former spy, escape and arrive stateside via a shipping container.

When a 14-year-old foils a home invasion, Gibbs suspects the teenager is withholding pertinent details.

The NCIS team, alongside the FBI and MI6, continue an international manhunt for an escaped British spy who has left one colleague fighting for their life in ICU.

NCIS, the FBI, and MI6 continue an international manhunt for an escaped British spy who is targeting current and former agents.