
NCIS has firmly established itself as a television phenomenon, and any discussion of its influence must highlight the original Major Case Response Team (MCRT) and the unforgettable characters that helped shape the show. Iconic figures such as Leroy Jethro Gibbs, Abby Sciuto, Tony DiNozzo, Dr. Ducky Mallard, and Kate Todd have each contributed uniquely to the show’s dynamic. Although their roles have been seamlessly filled in subsequent seasons, their legacy continues to resonate with devoted fans.
Over the years, as NCIS captivated audiences and secured its place as one of the longest-running series in television history, it expanded into five successful spinoffs. From NCIS: Los Angeles to NCIS: Hawaiʻi, the franchise’s impact on contemporary television is undeniable. Additionally, the anticipated Tony & Ziva spinoff is set to enrich the NCIS storyline, promising even more engaging content for fans.
5. Kate Todd
Played by Sasha Alexander

Caitlin Todd’s shocking death in the second season remains one of the most impactful moments in NCIS history. Tragically, Sasha Alexander, the actress behind Kate, found the workload overwhelming, leading to the necessity of writing her character out of the series. This abrupt departure meant that audiences never saw Kate evolve fully.
Nonetheless, Kate was an astute investigator who often served as the voice of reason within the original MCRT team. Her empathy and relatability made her beloved among viewers, and her unexpected demise left a significant mark on the show’s trajectory, altering its dynamics for seasons to come. We fondly remember Kate’s contributions and the warmth she brought during her time.
4. Dr. Ducky Mallard
Played by David McCallum

The late David McCallum’s portrayal of Dr. Donald “Ducky”Mallard was integral to the charm of NCIS. Ducky wasn’t just the medical examiner; he was a beacon of wisdom, expertise, and compassion, providing many memorable moments throughout the series. As the last original member of the MCRT at the time of his passing in 2023, his legacy endures.
Known for his insightful and patient nature, Ducky delivered some of the series’ most poignant quotes, often laced with humor and heartfelt wisdom. His storylines may not always directly drive the plot, but his presence played a crucial role in shaping the soul of NCIS, making him a standout character that viewers cherished.
3. Tony DiNozzo
Played by Michael Weatherly

When discussing charisma, it’s impossible to overlook Anthony DiNozzo, brought to life by Michael Weatherly. DiNozzo, affectionately known as Tony, captivated audiences with his humor, charm, and knowledge of film trivia, while also showcasing his investigative skills. His evolution from a carefree womanizer to a devoted partner added depth to his character and offered viewers a compelling arc.
The anticipation surrounding the upcoming NCIS: Tony & Ziva spinoff reflects viewers’ affection for Tony and his complex relationships with his team members. Despite leaving the show in 2016 after a memorable 13-season run, his impact on the NCIS legacy is undeniable, and fans are eager to see him return.
2. Abby Sciuto
Played by Pauley Perrette

As a forensic specialist, Abby Sciuto, portrayed by Pauley Perrette, left an indelible mark on NCIS. Her eccentric personality and brilliance made her one of the franchise’s most beloved characters. Abby’s departure in season 15 was felt acutely by fans, who mourned the loss of her infectious energy.
Abby, adopted with deaf parents, brought a unique perspective that resonated with many. Her striking gothic appearance contrasted with her vibrant, upbeat demeanor, making her a memorable figure in the world of forensic investigations. Always seen with her iconic Caf-Pow, Abby brought a sense of excitement to forensic science and remains a character fans hope to see return to NCIS someday.
1. Leroy Jethro Gibbs
Played by Mark Harmon

At the heart of NCIS is its stalwart leader, Leroy Jethro Gibbs, whose fearless and intuitive nature has defined the show. While multiple actors have portrayed Gibbs, it was Mark Harmon who truly embodied the character, leading the series for 18 seasons and leaving an enduring impact when he departed in 2021.
NCIS Franchise Shows | IMDb Rating |
---|---|
NCIS | 7.8 / 10 |
NCIS: Los Angeles | 6.8 / 10 |
NCIS: New Orleans | 6.8 / 10 |
NCIS: Hawaii | 6.8 / 10 |
NCIS: Sydney | 5.9 / 10 |
NCIS: Origins | 7.3 / 10 |
Gibbs’ characteristic traits, from his iconic boat building to his candid leadership style, have cemented his legacy within the franchise. Even after his exit, the profound influence he had on shaping the narrative and direction of NCIS remains a testament to both Harmon’s performance and the lasting impact of Gibbs as the series’ emotional core.
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