NCIS has reached a remarkable milestone with the airing of its 500th episode on March 24, 2026, solidifying its status as a television staple. The series, which focuses on special agents from the Naval Criminal Investigative Service, has captivated audiences for over two decades, with a peak viewership of 9.7 million in the 2023-24 season.
Created by Donald Bellisario, NCIS originally spun off from the series JAG, which concluded in May 2005. The show has evolved significantly since its debut, with Mark Harmon leading the team as Leroy Jethro Gibbs until his departure. The series has garnered 3 Emmy nominations but has yet to secure a win, a notable point considering its long-standing presence on air.
Throughout its run, NCIS has expanded its universe with 5 domestic spinoff series and one international spinoff, NCIS: Sydney, demonstrating its widespread appeal. The franchise has been licensed in more than 200 international markets, showcasing its global reach and influence.
Despite a decline in viewership to 7.85 million in the 2024-25 season, NCIS remains a dominant force in broadcast television, having been the highest-rated series for five consecutive years. The legacy of the show is further enriched by the late David McCallum, who portrayed Dr. Donald ‘Ducky’ Mallard from the first season until his death in 2023.
As the series continues to evolve, fans and critics alike are eager to see how NCIS will maintain its relevance in an ever-changing television landscape. Observers expect the show to explore new narratives while honoring its rich history and the contributions of its beloved characters.