Cote de Pablo's surprise return to NCIS was shrouded in secrecy, with the showrunners going to extreme lengths to keep it under wraps.
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Executive producer Mark Horowitz described the level of secrecy around de Pablo's comeback as 'invoking Fight Club rules', meaning they went to great lengths to prevent any leaks.
De Pablo's character Ziva David, who was previously killed off, made a surprise appearance in the Season 16 finale and then featured in multiple Season 17 episodes, shocking fans who thought her story had ended.