Hetty's former Vietnam war colleagues partner with NCIS after a former Navy commander kidnaps a corrupt Veterans Affairs administrator who has been siphoning funds.
The NCIS team investigates a defense contractor, who is designing a nuclear attack weapon, after her estranged husband says he has proof she is selling Navy secrets to a foreign government. Kensi then goes undercover as a professional dancer at the Cuban club where the husband works, while Deeks works undercover as the bathroom attendant.moreless
An engineer who was developing a new guided missile destroyer is murdered. Callen and Sam go undercover to track his co-worker aboard a plane to Tokyo who intends to sell the classified intel. Meanwhile, Deeks plans a surprise get-together for Kensi and her out-of-town friends.moreless
The U.S. Treasury Department is hacked, and Neil and Eric go undercover inside a couple's retreat to track a tech-savvy husband and wife who are linked to the crime. Meanwhile, Digital Forensics Specialist Dave Flynn arrives from the NCIS cyber office in San Diego to run ops while Eric and Neil are on assignment.moreless
Sam assumes a former alias in a risky undercover operation to take down an elusive drug lord. Meanwhile, Hetty interrupts Callen and Anna's romantic night to assign them a prisoner escort mission.
After a retirement home resident is kidnapped, the NCIS team uncover a pair of con artists: Ginger and Edward O'Boyle, who hop from home to home scamming the elderly out of their money. Meanwhile, Callen confronts his father on his illegal activity and the danger it places on their family.moreless
Emotions run high for the team as one agent is held in an unknown location and tortured by the mole, while another discovers he was betrayed by someone he least expected.
Hetty goes rogue, leaving the NCIS team completely in the dark, and the mole kidnaps one of the agents.
Planted evidence by the mole results in the arrests of Callen, Sam, Granger and Deeks, on the same day Under Secretary Duggan returns for Hetty's resignation.
A Navy reservist is killed while protecting a city councilman. Sam goes undercover at a private security firm with links to several criminal organizations to investigate. Meanwhile, Callen and Anna discuss the next steps in their relationship.moreless
The team investigates the disappearance of a Navy lieutenant commander who was working with the NSA on foreign cyber threats. Later, the team celebrates the holidays together.
A new lead in the ongoing mole investigation is uncovered after two men disguised as sheriff's deputies are killed in front of Callen's home by an unknown female assailant. Meanwhile, Nell visits a prison to interview an inmate who is withholding information on the department's leak.moreless
Callen interrogates his father after he is found in an NCIS patient's hospital room during a radiation poisoning case. Meanwhile, the team discusses their Thanksgiving plans.
NCIS investigates when a graduate student who is developing an electromagnetic weapon for the Navy is attacked. The probe reveals a connection to international warfare. Meanwhile, Kensi continues with grueling physical therapy for her spinal injury.moreless
Callen goes undercover as a patient in a mental health hospital to search for an NSA agent who disappeared while tracking an ISIS cell trying to cross the Mexican border.
A maintenance man stops an intruder from attacking a lieutenant commander but the probe uncovers his secret past which puts a teen in danger. Meanwhile, Sam must decide which colleague he should take to a football game.moreless
A navy machinist with high security clearance is murdered on the roof of a downtown high-rise building. Anna Kolcheck partners with Callen to investigate. Meanwhile, Sam assists Hetty in the on-going mole probe.moreless
After a Homeland Security agent is poisoned by a notorious Triad assassin, NCIS uncovers a warehouse of counterfeit purses and a money trail to stolen government funds. Meanwhile, Nell joins the team in the field.moreless
The team investigates an abduction case while down two members, with Hetty being held in Washington, D.C., for questioning in the mole probe, and another still in ICU following the mission in Syria.moreless