Legend (Part 2)

With the appearance of Mossad officer Michael Rivkin, Tony finds himself being 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. The NCIS team members soon find themselves racing against the clock to stop Rivkin as they attempt to capture a member of the terrorist cell but it's not easy as Rivkin is making things hard for them by putting all the members of the terrorist cell to sleep one by one before they can get a chance to arrest one. The episode ends with Callen being critically injured in a drive-by shooting and also Ziva being in bed with Rivkin, implying that they might have slept together.