NCIS is one of the longest-running and most memorable crime dramas in American television history. Since its debut in 2003, the series has captivated millions of viewers around the world with its artistic storytelling, down-to-earth characters, and distinctive humanity. However, what is more surprising are the little-known behind-the-scenes stories that reveal the complexity and restraint behind the spotlight of a television blockbuster.
1. Mark Harmon – The Soul of NCIS
Mark Harmon, who plays Agent Leroy Jethro Gibbs, not only plays a central role in the series but also serves as executive producer for many seasons. He is considered the keeper of the soul of NCIS, steadfastly maintaining the show’s integrity, principles, and intimacy for more than two decades.
2. Mark Harmon and Pauley Perrette’s behind-the-scenes feud
Pauley Perrette (Abby Sciuto) was one of the most beloved faces on NCIS, but her sudden departure after season 15 raised questions. Perrette later hinted at a serious incident – which included Mark Harmon’s dog biting a crew member and unresolved tensions. While she didn’t directly criticize anyone, she declared that she would “never return to NCIS.”
3. Abby loves science in real life, too
Pauley Perrette actually studied psychology, criminology, and forensic science before pursuing acting. This background helped her play Abby so naturally that many fans consider her the soul of the series.
4. DiNozzo and the “improvisational” scenes
Michael Weatherly (Anthony DiNozzo) is famous for his frequent improvisations of lines that are completely off-script. This makes many scenes more natural and intimate. He and Cote de Pablo (Ziva David) also have a very good relationship in real life, which made the producers decide to develop a love line for the two characters.
5. Ducky was a superstar before joining NCIS
David McCallum (Dr. Donald “Ducky” Mallard) was famous in the 60s as Illya Kuryakin in The Man from U.N.C.L.E.. He later returned as a respected “veteran” in NCIS, remaining with the show until his death in 2023.
6. The forensic department in the show has the support of real experts
The NCIS scriptwriting team collaborated with many experts from the US Navy and forensic science to ensure authenticity in professional details. Even some of the forensic props used in the show were simulated from real equipment.
7. Gibbs’ Rules – the immortal symbol of NCIS
“Gibbs’ Rules” were originally just small details to build character personalities, but later became a cultural symbol of the show. Fans even printed the rules in notebooks as souvenirs. Rule number 9 – “Never go anywhere without a knife” – is the most repeated sentence, becoming Gibbs’ iconic quote.
From the behind-the-scenes stories above, it can be seen that the success of NCIS comes not only from the script or the cast, but also from the respect, commitment and enthusiasm of the entire team behind the camera. That is why NCIS has lived forever in the hearts of fans for more than 20 years.
