While the cast has rotated quite a bit over that time, Leroy Jethro Gibbs, played by Mark Harmon, has been a staple ... the ...

That's right, we almost had "NCIS," starring Mark Harmon as ... proved popular enough that even as it expanded, Harmon remained the poster child for the franchise and Gibbs even went on to ...

Mark Harmon starred alongside Sean Connery in the 1988 flop that earned a 1.5-star rating from Roger Ebert and a 41% Rotten ...

Along with the late David McCallum, Mark Harmon is arguably the actor ... In short, though, Harmon is a poster child for this franchise, and that's why fans were shocked when he parted ways ...