It’s been 22 years of NCIS and the special agents you know and love are about to embark on Season 23 together. The cast has seen stars come and go over the years, including Mark Harmon’s Leroy Jethro ...

It's been 22 years of NCIS and the special agents you know and love are about to embark on Season 23 together. The cast has seen stars come and go over the years, including Mark Harmon's Leroy Jethro ...