Where Is the Original “NCIS” Season 1 Cast Now? See the Stars 23 Years After Its Premiere 

**NCIS Continues to Captivate Audiences After Two Decades**

Since its debut on 23 September 2003, *NCIS* has often been regarded as one of the most successful procedural dramas in television history. The series has experienced numerous transformations over the years, including significant cast changes and expanded narrative arcs, yet it remains as popular as ever. Now entering its 24th season, the show continues to evolve while maintaining its core premise of Naval Criminal Investigative Service agents tackling a variety of intriguing cases.

Over its two-decade run, *NCIS* has seen a number of original cast members depart, including notable stars like Mark Harmon, Pauley Perrette, and Michael Weatherly. Each of these actors has contributed significantly to the show’s legacy, which has included multiple spin-off series and an expanding universe within the realm of streaming platforms. The show’s current season premiered on 6 October 2026 and is accompanied by exciting developments such as the launch of spinoffs including *NCIS: Origins*, which is now in its third season, and the brand-new *NCIS: New York*.

Mark Harmon, who portrayed Special Agent Leroy Jethro Gibbs for nearly 20 years, has a remarkable history with the franchise. Gibbs was initially introduced on the legal drama *JAG* before *NCIS* emerged as a standalone series. Harmon decided to exit *NCIS* in 2021 after a long tenure, with his character opting to stay in Alaska rather than returning to Washington D.C. Despite his departure, Harmon remains involved with the franchise as an executive producer and narrator for *NCIS: Origins*, a prequel showcasing the earlier years of Gibbs.

Sasha Alexander, another original cast member, played Special Agent Caitlin Todd for the first two seasons of *NCIS*. Tragically, her character met a dramatic end during the season two finale, but Alexander has made various guest appearances in subsequent seasons. Since her time on the show, she has enjoyed a successful career, starring in notable series such as *Rizzoli & Isles* and *Shameless*. Alexander has also shared insights into the demanding filming schedule on network television, which consisted of long hours and a rigorous episode count each season.

Michael Weatherly, who portrayed the charismatic Special Agent Anthony DiNozzo, was a mainstay on the show from its inception until 2016. After his departure, Weatherly stepped into the lead role of the CBS drama *Bull*, although his tenure there was marred by allegations of inappropriate conduct, leading to the show’s cancellation in 2022. Despite the controversies, Weatherly returned to the *NCIS* franchise in 2025, reuniting with former co-star Cote de Pablo for a spinoff series, *NCIS: Tony & Ziva*.

Pauley Perrette, known for her eccentric portrayal of forensic scientist Abby Sciuto, also made significant contributions to the show’s identity over 15 seasons. After announcing her exit from *NCIS* in 2018, Perrette voiced concerns regarding multiple incidents of on-set assault, shedding light on the darker sides of Hollywood. Following her departure, she starred in the sitcom *Broke*, although it was short-lived. Perrette has since highlighted a personal health journey, discussing her recovery from a stroke while expressing gratitude for her current well-being.

The series also mourned the loss of David McCallum, who passed away in September 2023 at the age of 90. Known for his role as Dr. Donald “Ducky” Mallard, McCallum captivated audiences with his compelling performances over two decades. He had an illustrious career prior to *NCIS*, notably as Illya Kuryakin in *The Man from U.N.C.L.E*. Although McCallum is no longer with us, his legacy continues to resonate, remembered by colleagues and fans alike for his warmth and dedication to the craft.

As *NCIS* progresses into its 24th season and beyond, the show’s ability to both retain loyal viewers and attract new fans is testament to its compelling narratives, dynamic characters, and ongoing relevance in contemporary television. With the introduction of new agents and ongoing collaborations across its spin-offs, the franchise shows no signs of slowing down. For aficionados of procedural dramas, *NCIS* has proven itself to be a stalwart presence on screen, continuing to engage audiences with each unfolding investigation.