CBS is celebrating the 500th episode of NCIS after nearly 23 years on-air. Originally a spin-off of JAG in 2003, NCIS has expanded its franchise with six additional spin-offs and has featured beloved cast members like Mark Harmon and Michael Weatherly. The landmark episode, titled “All Good Things,” features Gibbs (Harmon) and his team responding to a marine’s son in need, risking their careers. Sean Murray, the last original cast member, reflects on the show’s legacy and continuity through evolving storylines and characters. NCIS has remained a fan favorite, airing its milestone episode tonight at 8 p.m. ET/PT.
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