The Mossad connection

Ducky and Gerald are held hostage in the autopsy room of NCIS headquarters by an armed intruder (Rudolf Martin), whose purpose is unexplained.

Gibbs' worst fears are confirmed when he learns that his nemesis, Arab/Israeli double agent Ari (Rudolf Martin), is back in Washington D.C. on assignment to kill him. Ultimately, the NCIS team discovers that Ari has a bigger plot... and they end up paying the ultimate price trying to thwart it--the death of a team member.

While the NCIS team deals with Kate's death, Gibbs' determination to finally put an end to Ari's reign of terror mounts.

Ari continues to wreak havoc on the NCIS team as he uses its members as pawns in the game he is playing with Gibbs.

With the appearance of Mossad agent Michael Rivkin, Tony is forced to question Ziva's loyalty to NCIS. Meanwhile, in Los Angeles, Special Agent Callen goes undercover to try to catch a terrorist cell while OSP psychologist Nate Getz discovers the startling truth about Gibbs and Special Agent Lara Macy's relationship.

As the hunt for Ziva's replacement begins, Gibbs and his remaining team members must head back to work with the past still weighing heavily on their minds.

While the NCIS team investigates the link to a dead journalist and a Navy petty officer, Ziva is taken aback by the sudden emotional visit by her father, who she hasn't seen in more than two years. While Ziva questions the purpose of her father's visit as the Director of Mossad, her father insists he is in the U.S. strictly to see his daughter for Shabbat dinner.

In the aftermath of an event that strikes close to home, the NCIS team unites to seek answers and demand justice in order to protect their most vulnerable colleagues.

While the NCIS team investigates the murder of a Mossad officer in Virginia, Tony and Ziva depart for Berlin as they track her father's killer.

In retaliation for the murders of Eli David and Jackie Vance, the NCIS team feverishly searches for Bodnar despite orders from Homeland Security to relinquish the case.

Department of Defense investigator scrutinizes the NCIS team's response to the Bodnar case involving the murder of Ziva's father and Vance's wife. Meanwhile, the team examines whether a Petty Officer is suffering from paranoia or if his claims of being followed are tied to a matter of national security.

The international manhunt for Eli David and Jackie Vance's killer turns into a federal witch hunt against Gibbs and the team, which questions their unconventional methods and threatens their future at the agency.

Determined to locate Ziva, Tony chases leads in Israel in search of her current whereabouts. Meanwhile, Gibbs and the team continue the hunt for Parsa and his growing terrorist ring.

The NCIS, FBI and MI6 teams continue the international manhunt for a spy who's targeting current and former agents. Anthony DiNozzo bids farewell to NCIS.

Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends, and what led to her return.

With their lives in danger, Gibbs and Ziva's rogue investigation takes an unexpected turn when a possible terrorist plot is revealed.

Gibbs and the team assist Ziva with "the one thing" she said she would need to take care of before returning to her family.

Gibbs must face the reality of his actions after he assists Ziva with "the one thing" she said she would need to take care of before returning to her family.