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Birth Name:Thomas Mark Harmon
Birth Place:Burbank, California, United States
Crime solving never sleeps
Expect a time jump, a milestone episode, and more
Do their profiles reveal clues about Season 18?
Answers on when to expect a return
Episode writer Gina Monreal breaks down the importance of the story
Here's where you can watch!
Mark Harmon will be back, though
"What happens down there will change them"
His deep cover days resurrect some old sins
Plus: Who's hacking NCIS?