Nicolas Mason Sr.
Gender: Male   Male
Portrayed by: William Devane
 First Appearance
  ●   NCIS: Worst Nightmare (episode).
 Last Appearance
  ●   NCIS: Worst Nightmare (episode).
List of Appearances

Nicolas Mason Sr. is the father of Navy Commander Nicolas Mason Jr., father-in-law of Navy Lieutenant Lisa Mason and also the grandfather of Nicolas and Lisa's daughter, Rebecca Mason.



NCIS Season 8Edit

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