The 10th season of the military-themed crime drama picks up mere seconds after the Season 9 finale in which a car bomb exploded in the Navy Yard and ripped through NCIS headquarters. Questions abound about who made it through unscathed, but one thing is for certain: revenge-minded terrorist Harper Dearing (Richard Schiff) is behind the attack. The president gives permission for Dearing to be terminated with "extreme prejudice," if necessary, and Gibbs (Mark Harmon) takes him at his word. As for Ducky (David McCallum), he goes on medical leave to recover from a massive heart attack and uses the time to reinvestigate a case from 12 years earlier that has implications in the present. Later, Ziva's father, Mossad director Eli David (Michael Nouri), visits Washington, D.C., to work on a peace treaty with an Iranian intelligence officer but a deadly turn of events during his stay once again devastates the NCIS family. The result is a massive international manhunt that brings Gibbs and his entire team under investigation by the Department of Defense. The probe threatens to end Gibbs' career, along with a number of his loyal colleagues. Michael Weatherly, Cote de Pablo, Pauley Perrette, Sean Murray, Rocky Carroll and Brian Dietzen also star.