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'NCIS: Sydney' Finale Sneak Peek: Watch JD Frantically Pursue His Son's Kidnapper (Exclusive)

The crime spinoff's first season concludes with a nail-biting finale on Tuesday.

In ET's sneak peek at Tuesday's season 1 finale, Jim "JD" Dempsey (Todd Lasance) gets a frantic call that hits close to home. ET spoke with the NCIS: Sydney cast ahead of their series premiere last fall, and they promised that the new franchise spinoff will have just as much heart as the original beloved procedural, as well as plenty of new drama. "The audience comes for the murder, they come for the crime, but they stay for the charm and the charisma and the characters," shared Olivia Swann, who plays NCIS Special Agent-in-Charge Michelle Mackey.

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