When a petty officer is found murdered, Gibbs learns about the mysterious connection between the disbanding of his team and the case.
While investigating a mysterious suicide of a Navy Lieutenant aboard an aircraft carrier, DiNozzo learns that the suicide may actually be a part of a much deadlier scheme.
When Senator Patrick Kiley seeks Gibbs' help to solve the murder of a young Naval officer, the NCIS team find themselves pushed inside the world of Washington politics.
Secrets from Gibbs' past are revealed when the NCIS team has to travel back to his hometown to resolve a murder investigation.
While on the hunt after a marine's brutal murderer, the NCIS team and Gibbs find themselves working against FBI Agent Fornell yet again.
The NCIS team is forced to investigate a crime during Halloween where a psychotic murderer leaves clues of its next victim's identity on the net.
Gibbs is put in a tough spot when he has to handle an assistant rookie assigned to his team by Vance to investigate a bank robbery case.
A shocking secret surfaces when the team is pushed into a war game, and one team member will face serious consequences.
After a shocking reveal, the NCIS team if forced to prevent the heist of government secrets by using information from questionable sources.
While investigating the death of a petty officer in a car crash, the NCIS team learns of his violent secret life; underground street fighting.
During the week of Christmas, the NCIS team is working overtime searching for a prime suspect who turns out to have been dead for 17 years.
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 past are revealed when he ends up stabbed at the crime scene.
The NCIS team investigates a bizarre murder of a sergeant whose suspicious private life might be the reason why he got killed.
The NCIS team finds themselves involved in a city gang while investigating the death of a Marine, and Gibbs must face his past once again when he finds a message at the scene of the crime.
When one of Tony's old cases ends up re-opened, he switches roles with Gibbs to finally solve the crime.
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 kid discovers a weapon that someone was killed with, the entire family ends up under investigation, as the NCIS team has to find out who was the last one that used the weapon and who got shot with it.
Gibbs has to put his personal feelings aside and work with Trent Kort who returns in order to track down a dangerous criminal.
Abby has to take over a top secret government mission when their scientist goes missing, but soon realizes things may not be as they seem to be, while the rest of the team worries about Abby's safety.
The team heads to LA to work with the team there to solve a murder investigation, which soon turns into something bigger.
In Los Angeles, Gibbs and McGee continue working with the NCIS division in order to track a terrorist cell. Agent Callen goes undercover, while a psychologist uncovers the truth about the relationship between Gibbs and Agent Macy. Meanwhile, Tony fears that Ziva may not be loyal to NCIS.
When an ICE agent is murdered after a security breach at the SecNav's residence, the NCIS team is forced to work with the FBI and the ICE in order to solve the murder. Meanwhile, Tony faces Rivkin.
After Tony's confrontation with Rivkin, the NCIS team flies to Israel for a final showdown, where they aren't exactly welcome by Ziva's father, the head of Mossad. Gibbs has to make a tough choice as the situation gets even more complicated.