After her character's surprise appearance at the end of season 16, actress Cote de Pablo is reprising her role as Ziva David in NCIS' 17th season. Understandably, though, before the news broke, her character's return from the dead was kept a strict secret.
"The first day on set, they made everyone sign nondisclosure agreements — which means no one could talk about this mystery guest they were having as an actor," Cote says. "They closed the set … they brought me in and literally it was like an undercover mission."
Tune in to "NCIS" on Tuesdays on CBS.