Mark Harmon returns to 'NCIS' for a special crossover with 'NCIS: Origins,' airing Tuesday at 9 p.m. ET/PT on CBS. | Entertainment Tonight

**NCIS** has become one of the most successful and enduring television dramas in history, captivating audiences for over two decades. The series follows a team of special agents from the Naval Criminal Investigative Service as they solve complex crimes involving the U.S. Navy and Marine Corps. From its very first episode, *NCIS* established a unique blend of action, humor, and heartfelt storytelling that set it apart from other procedural dramas. The characters’ strong chemistry and emotional de

Gibbs' NCIS 1000th Episode Absence Is Made Worse By Ignoring One Original Character

NCIS and NCIS: Hawaiʻi previewed in CBS trailer