Co-showrunners David J. North and Gina Lucita Monreal tell TheWrap which characters to keep an eye out for and how much Mark Harmon to expect on screen Austin Stowell in "NCIS: Origins." (Greg Gayne/CBS) “NCIS: Origins” may not stray far from the DNA of its flagship, but the updates to the formula make revisiting Leroy Jethro Gibbs’ past a “darker” chapter for the beloved CBS franchise. The new series turns the clock back to 1991, when Gibbs (Austin Stowell, taking over for Mark Harmon) first

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