Set among military personnel in a West Coast office for special projects, crime procedural focuses on the agents\' undercover and surveillance work.
Cast: Chris O\'Donnell, Daniela Ruah, LL Cool J, Linda Hunt, Barrett Foa, Peter Cambor, Adam Jamal Craig, Rocky Carroll, Eric Christian Olsen, Ronald Auguste, Renée Felice Smith, Brian Avers, Daniel Hugh Kelly, Pauley Perrette, JR Bourne
The NCIS team continues the case with ATF and the stolen military-grade weapons. Also, Callen and Anna decide on an impromptu wedding.
When an ATF agent goes missing, the bureau seeks help from the NCIS team to investigate stolen military-grade weapons and locate the agent. Also, Callen and Anna continue to plan their wedding, Rountree's sister interviews for medical school and Sam encourages his father to take part in the drug trial.
When four people, including a CIA officer, are shot and killed in broad daylight, the NCIS team suspects the attacks have something to do with DRONA. Also, Pembrook meets with Callen and gives more insight into his past.
The NCIS team must investigate when a Navy reservist is stabbed and his lab full of pesticides and insects is ransacked. Also, Kilbride offers Sam the interim operations manager position and Rountree thinks about his future.
The NCIS team is tasked with assisting NCIS’ cold case homicide unit with a case from 2003 and a missing Navy petty officer. Also, Kilbride and his son, Alex, work to rebuild their relationship.
When NCIS receives a message, Fatima and Devin work together to solve the case. Kilbride plans to visit his son, and Callen asks Sam an important question.
Sam Hanna must go undercover as a fighter to catch the leader of a gang dealing drugs on the streets
When a petty officer is found dead with an apparent suicide note, the NCIS team must investigate the mystery surrounding his death. Also, Callen and Anna begin wedding planning and Sam has a heart to heart with his daughter.
A mystery woman attacks the founder of an AI company, the team must identify the woman before the next major global conflict ensues. Kilbride's ex-wife, Elizabeth comes to ask him to think about reconnecting with their son.
The NCIS team must quickly find Kensi and Fatima after they are kidnapped and drugged while searching for a missing Navy lieutenant who they learn has ties to a dangerous militia.
When Sam's friend Tom Olsen finds himself being hunted down by enemies from his past, the NCIS team must find out who is after him.
In Washington D.C. to celebrate the retirement of a former professor. The NCIS agents are forced to investigate the professor's suicide. Each member learns a hitman is out to kill each and every one of them - with $200,000 bounties on them.
When NCIS investigates a shootout on a boat in which a rare cultural artifact is stolen, they're shocked to learn who owns the boat.
NCIS investigates an arson attack at Global West Ventures Corp, a naval defense contractor. Rountree connects with an ex and Kilbride gives Callen files on Pembrook.
When a Marine falls ill during a training mission due to an attack by a genetic weapon, the NCIS must track down the person responsible for unleashing it. Also, Deeks struggles with balancing work and home life when Rosa comes down with the flu.
NCIS is called to investigate after Rear Admiral Ted Gordon is abducted from his home. Kensi struggles with being the fun parent while Deeks is apartment hunting with his mom.
NCIS is called to investigate when a woman is seen fleeing the scene of her husband's murder. Roberta Deeks comes into town to meet Rosa, and Sam looks for another aide for his father.
Aiden Hanna's plane crashes and he is accused of being at fault for the accident, the NCIS team must investigate to clear his name. Rountree considers how he wants to handle the aftermath of the incident with the LAPD and Sam finds a new caretaker for his father.
NCIS team join forces with the FBI when a group of grisly murderers known as "The Body Stitchers" returns after evading capture by NCIS years ago. Sam's dad makes a new friend in Arkady.
After an architect duo who specializes in designing secure buildings is kidnapped, the NCIS team mounts a search to bring them home. Also, Deeks and Kensi realize they may need to get Rosa some help with her schoolwork.
The NCIS team searches for a suspect and their motive following the bombing of a large facility where military combat drones are assembled. Callen and Kilbride get troubling news about a body found in Syria.