When the team looks into a fatal dog mauling, Abby risks her career to prove the dog is innocent. Meanwhile, Gibbs gets closer to 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 suspected by the FBI of terrorist recruitment is found dead near a Mosque.
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 he is the subject of a secret experiment.
The NCIS team plays babysitter to a 9-year-old boy whose father, a trained survivalist, is wanted in connection with a cold case murder.
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.
When Gibbs agrees to help a childhood friend of his deceased daughter, he finds himself at the center of an emotional and soul searching journey into his past.
Gibbs and the team investigate a mysterious death aboard a top-secret naval research ship, only to discover an abandoned ship and a deadly secret that could cost them their lives.
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.
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.