"Legend (Part 2)"

When Ziva identifies Rivkin as an undercover Mossad agent operating in the United States, Tony is forced to question her loyalty to NCIS. Meanwhile, in Los Angeles, Callen goes undercover as Liam in an effort to prevent a terrorist cell from obtaining weapons and launching an attack on Los Angeles. At OSP headquarters, psychologist Nate Getz (Peter Cambor) discovers the startling truth about Gibbs and Special Agent Clara Macy's (Louise Lombard) relationship. The episodes concludes with Callen being shot multiple times in the chest.