'NCIS' longest-serving cast member with 400+ episodes was never supposed to be a main character

Sean Murray's Agent McGee was only supposed to be in one episode of NCIS, but a last-minute invite back changed everything.

After 500 episodes and a big twist, ‘NCIS’ continues to thrive with no signs of stopping

With its 500th episode, which features a major character death, the show ranks among the longest-running scripted, ...

"NCIS" at 500: Cracking the code

The CBS procedural, now in its 23rd season, is marking its 500th episode tracking agents of the Naval Criminal Investigative ...