That's Eli David(:

Eli David, played by Michael Nouri, has had a recurring role as the head of the Israeli Mossad, who also happens to be Ziva David's father. Though appearing to be uncaring about his children, Eli has his reasons for his inability to care for their well being. He and Director Vance share a history since Amsterdam when Eli saved his life from a Russian hit squad. Eli made a few appearances in the the series. Towards the end of the sixth season, Eli sends Michael Rivkin to Washington in what Vance describes as a not-so-subtle message that he does not think NCIS are doing their jobs. During "Semper Fidelis", Eli is suspected of using Michael Rivkin to spy on the Americans and using the intelligence to locate a terrorist handler and find a training camp located in Somalia. He has also used Ziva to spy on NCIS and that she had originally been sent to the agency to kill Ari and gain Gibbs' trust. In "Aliyah", when Ziva, Gibbs, Vance, and Tony travel to Israel, Eli David accuses Tony of killingMichael Rivkin out of jealousy; Tony accuses him of sending every corrupt Mossad officer to Washington for NCIS to deal with. During the episode "Good Cop, Bad, Cop", Eli sends Malachi to Washington to discredit Ziva and her account of events that led to her capture prior to "Truth or Consequences", which finally prompts her to admit that her father is corrupt. However, during the events of the "Enemies Foreign"/"Enemies Domestic" 2-parter, Ziva managed to reconcile with her father after understanding his reasoning.

That's Michael Rivkin(:

Michael Rivkin, portrayed by Merik Tadros, first appeared in the episode "Last Man Standing" as a Mossad agent. He was working with Ziva David when she was on an undercover mission for the Mossad in Morocco (Ziva having been dismissed from NCIS in the previous episode). Later on in the episode, he was seen in the office of the head of Mossad, Eli David, Ziva's father, as Ziva talks on the phone to Gibbs.Tony becomes suspicious of the man that Ziva appears to be dating, and keeps trying to find out who he is. For example, in the episode "Legend (Part 1)", Tony asks Abby to check the records on Rivkin. In the episode "Legend (Part 2)", Michael appears as an undercover Mossad agent who is investigating the same terrorists that NCIS is investigating, killing them off one by one before NCIS can apprehend them. He is asked to leave the US by NCIS agent in charge in Los Angeles, Lara Macy and later by DiNozzo, both of them citing laws that prohibit foreign intelligence operatives from working in the United States. In the episode "Semper Fidelis", what appears to be an open and shut case of an Immigrations, Customs and Enforcement agent killed by a terrorist is complicated by the presence of Rivkin, who is still in the US visiting Ziva. Tony traces communication with the terrorist's computer to Ziva's apartment, where he finds Rivkin. After attempting to arrest Rivkin for the murders of the ICE agent and the terrorist handler NCIS was tracking, a struggle ensues and Tony shoots Rivkin in self defense. Ziva later enters her apartment and attempts to help Rivkin but he later succumbs to his injuries and dies in hospital. Finally, in the episode "Aliyah", the relationship between Rivkin and Ziva comes out and this leads Gibbs, Leon Vance, and Tony to Israel. There Eli David accuses Tony of killing Rivkin out of jealousy.

That's Ari Haswari(:

Portrayed by Rudolf Martin. Haswari is a terrorist who attacked and wounded both Gibbs and Gerald Jackson when he infiltrated the NCIS morgue during the episode "Bête Noire". NCIS initially identified him as an undercover Mossad agent in the episode "Reveille", but he was a rogue agent working for Hamas and he was later found to be the leader of an Al-Qaeda cell in Washington, D.C.Both of his parents were medical doctors; Ari's mother, Hosmoya Haswari, was Palestinian and his father, while Dr. Benjamin Weinstein (actually Eli David using an alias) was Israeli. He underwent medical training in Scotland at the University of Edinburgh Medical School, in order to serve undercover inside the Gaza Strip, where his mother was killed during a retaliatory bombardment by Israel. The event prompted Ari to join the radical Islamic cause. It is shown that he hates his Israeli father as Eli David arranged for the attack on Gaza on a day when Ari was in the city. He preferred to be referred to as Haswari in school instead of Ari. Ari's motivation for his actions is his hatred of his father, who groomed him from birth to be a spy within Al-Qaeda. After the murder of Special Agent Kate Todd in the episode "Twilight", and several further attacks on NCIS members (including Gibbs) in the two part episodes "Kill Ari (Part 1)" and "Kill Ari (Part 2)", his reign of terror finally came to an end when Ari was killed by his half-sister, Mossad officer Ziva David, who is later offered and accepts a position at NCIS as Mossad liaison officer. It was revealed in the episode "Aliyah" by Director Vance that Ziva killed Ari under orders from their father (Mossad Director Eli David), in order to gain Gibbs' trust. Ziva initially did not believe that Ari was an enemy agent until he nearly killed Gibbs, when she heard the truth from his own lips. Ziva has not fully come to terms with killing her brother, and still experiences moments of guilt and hurt.