When a Marine Sergeant's body is discovered beneath the ice of a frozen pond, the N.C.I.S. team must dig deep for answers, uncovering disturbing truths about the local gang scene in the process.........
A Pentagon cryptologist is found dead from an apparent suicide while the team is in the middle of a search for a mole there. Abby finds evidence to suggest that someone was with the victim at the time of her death.
The NCIS team must protect Ziva when a suspect dies while being in custody, and her tactic might be the reason why the person died. The things become much more dangerous when the suspect's brother kidnaps Jenny, and demands the release of his brother in exchange for Jenny, but he has no idea that his brother is dead.
Gibbs is injured in a bomb blast on a Turkish merchant ship, which puts him in a coma. He wakes, suffering from an unusual form of amnesia, where he thinks it's 1991, when he had been in a coma from another trauma, having no memory of the last fifteen years... including his team. The physical trauma to his brain does not explain his amnesia, so the team tries to uncover the possible psychological reason for his amnesia, while also trying to determine who, and why the bomb was aboard the merchant ship in the first place.
A marine's body is found inside a new home. The body had been buried, then dug up, and put in the home. His 2 fiancées have been receiving letters from him for the past few months. Did one of them get wise?
A homeless veteran falls from a hotel room into a party with a lot of high ranking officials. During the investigation they discover a body of a young girl who had apparently been assaulted by the veteran.
Mc'Gee's restless writing night turns nightmarish when his under-age sister Sara turns up, with bloody hands and a constantly changing story. She's drunk and never could hold her liquor, but is the part she murdered someone without remembering who or why also imagined, or a recollection from a 4 hours black-out? Alas, the fatally stabbed corpse which NCIS investigates on Waverly, her college campus, is that of USS Enterpise seaman Jeff Petty, who dumped Sara for a cheerleader a year earlier. Her cellphone on the corpse puts Gibbs on that trace, and betrays Tim's (dis)...
A body falls out of a smoke stack on a Marine base. The FBI tries to take over the investigation when the body is linked to a serial killer who had vanished. Ducky and Gibbs discuss the source of their conflict.