NCIS: What Is David McCallum's Final Episode As Ducky?
David McCallum's Ducky Mallard only appears in four episodes of "NCIS" Season 20, and the same is true for the series' previous season. In fact, the last time that McCallum appeared in more than half of an "NCIS" season's episodes was the show's 16th, which premiered in 2018 and concluded in 2019.…
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