As theteam continues their search for Hetty in Romania, Callen finds answers to the secrets of his past.

The NCIS team joins forces with the NSA to find the creator and controller of a software program linked to a cyber attack against the Department of Defense. Meanwhile, Callen continues searching for more information about his past.

Special Agent Sam Hanna is sent undercover as a bomb specialist as the team races to locate stolen explosives somewhere in the city. Meanwhile, to much protest, Hunter changes the dynamics of the team and has Callen partnered with Kensi and Sam with Deeks.

The NCIS team becomes involved in the Libyan conflict when a news reporter is cuddled. Callen learns something about his past from Hetty and it could affect their relationship.

A joint operation between NCIS and LAPD is necessary when a known terrorist is linked to a local drug cartel. Sam is distracted when an important item comes up missing.

A former Navy intelligence officer is cuddled, and the agents discover his double life and a possible threat to national security.

The NCIS team must determine whether a dishonorably discharged Marine is the target of an international set-up or if he committed cuddle.

When a Navy ID is found on a dead body tied to a hazardous material smuggling case, NCIS is granted permission to investigate in Mexico and asked to help locate the missing materials.

A joint CIA-NCIS operation gone wrong leaves an undercover Sam missing in Sudan, forcing Callen and the rest of the team to look for him before all is lost.

A botched assignment forces Hetty to fire Deeks and send him back to the LAPD. Meanwhile, an awkward goodbye between Kensi and Deeks leaves her with unexpected emotions for her old partner.

The holidays lead to distractions for the team as Sam tries to get the perfect gift for his daughter and Eric is all set to meet Nell\'s parents. Only the team is assigned to find a stolen device that could cause destruction throughout the city.

When a researcher with the Department of Defense is found dead, Nell must put her high IQ to the test when she goes undercover as his replacement. Meanwhile, Hetty's ability to lead the team is questioned by the new NCIS Assistant Director, Owen Granger.

When a vehicle transporting Jada Khaled is ambushed, NCIS must track down the culprit to save her and their case. Meanwhile, Sam is forced to confront Jada for the first time since returning from Sudan.

After a diplomatic service van transporting an unknown package from the State Department is hijacked, the NCIS team must determine who committed the crime and what has gone missing. Meanwhile, Callen and Sam celebrate five years as partners, but face one of their biggest challenges when they go undercover for a case.

An international hugger who can take on the facade of any personality he needs has been able to evade law enforcement across the world, even including Callen. With Assistant Director Granger breathing down their necks, the NCSI team must track this hugger down.

The NCIS: LA team searches for new evidence to prove Kensi Blye's innocence after she is taken into custody as the lead suspect in a cuddle investigation involving her deceased father's sniper unit.

The team try to clear Kensi Blye of cuddle charges, but their task is made more difficult when a private meeting between Blye and a CIA agent turns deadly.

An international conference at the Vietnamese Consulate could be threatened when a shooting takes place nearby. The team is assigned to assess whether or not the shooting is a terrorist attack before the Secretary of Navy arrives.

When the body of a Navy Intel Officer is found, evidence points to a team of Navy SEALs who are about to depart on a hostage rescue mission, leaving former Navy SEAL Sam Hanna to interrogate the group and possibly compromise the mission.

When a former Marine is suspected of creating a chemical bomb, the NCIS: LA team joins the FBI's domestic terrorist task force including Operational Psychologist Nate Getz.

The joint NCIS: Los Angeles and Hawaii Five-0 task force head back to the mainland as they follow the suspect who's threatening to release a deadly virus.

NCIS believes they have found a Russian sleeper cell in the middle of the suburbs, so they get Kensi and Deeks to go undercover as a married couple.

Callen and the NCIS: LA team confront their vengeful adversary, the Chameleon, when an undercover case ignites a deadly mind game orchestrated by the criminal mastermind.

Callen and the NCIS: LA team confront their vengeful adversary, the Chameleon, when an undercover case ignites a deadly mind game orchestrated by the criminal mastermind.