Mark Harmon spent years chasing criminals on "NCIS"— but it was an off-screen encounter with a real agent that truly cracked open a turning point in his career. The actor first met retired NCIS ...

NCIS is a TV staple that has been on air for over two decades with multiple spin-offs including NCIS: New York, NCIS: Sydney, and NCIS: Hawai'i. Despite longtime NCIS star Mark Harmon leaving the ...