I own NCIS Seasons 1 - 19, after that, Mark Harmon,leaves, along with Michael Weatherby, Paulie Perrette, David McCallum, Sasha Alexander, Emily Wickersham, The updated Cast isn’t as good as the Original Cast. Which is why, I only own Seasons 1 - 19, Season 20 no Mark Harmon, and the Cast just kept going downhill in quality. Then NCIS Los Angeles, and NCIS New Orleans, very bad spinoffs.