NCIS and its characters were originally introduced in a two-part episode of the CBS television series JAG in April 2003. The show premiered on September 23, 2003, in the United States. Created by Donald P. Bellisario and Don McGill, and executive produced by Bellisario, Shane Brennan, Gary Glasberg, George Schenck, Frank Cardea, and Steven D. Binder, NCIS stars Mark Harmon as Supervisory Special Agent Leroy Jethro Gibbs, and Gary Cole as Supervisory Special Agent Alden Parker in charge of NCIS' Major Case Response Team. Based out of Washington, D.C., the team includes special agents Caitlin Todd (Sasha Alexander), Anthony DiNozzo (Michael Weatherly), Timothy McGee (Sean Murray), Ziva David (Cote de Pablo), Eleanor Bishop (Emily Wickersham), Alexandra Quinn (Jennifer Esposito), Nicholas Torres (Wilmer Valderrama), and Jessica Knight (Katrina Law), forensic specialists Abby Sciuto (Pauley Perrette) and Kasie Hines (Diona Reasonover), medical examiners Jimmy Palmer (Brian Dietzen) and Donald "Ducky" Mallard (David McCallum), medical examiners assistant Gerald Jackson (Pancho Demmings) and SIS attaché Clayton Reeves (Duane Henry). Operational psychologist Dr. Jacqueline Sloane (Maria Bello) assists the team during troubled times, while successive Directors Tom Morrow (Alan Dale), Jennifer Shepard (Lauren Holly), and Leon Vance (Rocky Carroll) command from on high.

Series overview

Episodes

Introductory episodes

The program and its characters are introduced during the eighth season of JAG. The JAG episodes, "Ice Queen" and "Meltdown", served as pilot episodes for the show. The character Special Agent Vivian Blackadder (Robyn Lively) does not appear in the series because producer Donald Bellisario felt that "she was a little soft for this kind of role". In October 2003, the two episodes were edited together and aired as "Navy NCIS: The Beginning".

Season 1 (2003–04)

Season 2 (2004–05)

Season 3 (2005–06)

Season 4 (2006–07)

Season 5 (2007–08)

Season 6 (2008–09)

Season 7 (2009–10)

Season 8 (2010–11)

Season 9 (2011–12)

Season 10 (2012–13)

Season 11 (2013–14)

Season 12 (2014–15)

Season 13 (2015–16)

Season 14 (2016–17)

Season 15 (2017–18)

Season 16 (2018–19)

Season 17 (2019–20)

Season 18 (2020–21)

Season 19 (2021–22)

Season 20 (2022–23)

Season 21 (2024)

Season 22 (2024)

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