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- Mark Harmon as Leroy Jethro Gibbs. Mark Harmon was born in Burbank, California and played Special Agent Leroy Jethro Gibbs for nearly two decades. The character was first introduced on the legal drama JAG in 2003 before NCIS premiered later that same year.
- Pauley Perrette as Abby Sciuto. Born in New Orleans, Pauley Perrette is best known for playing quirky forensic scientist Abby Sciuto on NCIS for 15 seasons after being introduced on JAG in 2003.
- Sasha Alexander as Caitlin Todd. Sasha Alexander was born in Los Angeles and played Special Agent Caitlin Todd in the first two seasons of NCIS. Her early TV credits include Dawson’s Creek and Friends.
- Michael Weatherly as Anthony DiNozzo. Michael Weatherly played Special Agent Anthony DiNozzo from 2003 to 2016. Before his breakout role, the actor appeared on The Cosby Show as Theo Huxtable’s roommate and on the soap opera Loving and its spinoff The City.
NCIS season 1 began with lead actors Mark Harmon, Sasha Alexander, Michael Weatherly, Pauley Perrette and David McCallum, however, the cast has consistently changed over the 21 seasons as...
- Sarah Weldon
- Mark Harmon (Leroy Jethro Gibbs) For 18 seasons and four season 19 episodes, Harmon starred as former U.S. Marine Corps scout sniper–turned–special agent Leroy Jethro Gibbs.
- Pauly Perrette (Abby Sciuto) In 2018, it was announced that Perrette would be leaving NCIS after playing the team's forensic scientist for 15 seasons. She also appeared as Abby on spin-offs NCIS: Los Angeles and NCIS: New Orleans.
- Sasha Alexander (Caitlin Todd) Since leaving NCIS after the show's third season, the actress went on to notably star on the TNT crime drama Rizzoli & Isles as Dr. Maura Isles from 2010 to 2016.
- David McCallum (Dr. Donald Mallard) McCallum has continued to play the role of NCIS chief medical examiner Ducky since the series premiere. Since Harmon's departure, he's the last remaining member of the show's original cast.
- Mark Harmon. Mark Harmon starred in the backdoor pilot episodes of JAG that led to its spinoff, NCIS. He led the cast of NCIS for 18 full seasons as Supervisory Special Agent Leroy Jethro Gibbs and became an executive producer on the series in 2008.
- Pauley Perrette. Pauley Perrette was a fan favorite as the quirky, mall goth forensics specialist Abbey Sciuto, and the role was a special one for her: She studied criminal science before becoming an actor.
- David McCallum. A veteran of the crime and action genre from his days on The Man From U.N.CL.E. series, David McCallum starred as the NCIS chief medical examiner Dr. Donald "Ducky" Mallard since Season 1.
- Michael Weatherly. Michael Weatherly starred as Senior Field Agent Anthony DiNozzo from Season 1 to 13, then left to star in Bull from 2016 to 2022. Weatherly was accused of sexually harassing Eliza Dushku on the set of Bull, leading CBS to pay her a $9.5 million settlement.
May 29, 2023 · Does it look like 20 years have passed between these pictures? Mark Harmon seemingly discovered the fountain of youth, as he looked nearly the same on his final episodes in season 19 as he...
- Megan Riedlinger
Jan 9, 2019 · When any show is on television for as long as NCIS has been, it's bound to lose a few key cast members along the way. Those who have stuck with the program know that all too well as beloved...
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Mar 12, 2021 · Throughout the many seasons of NCIS, there have been a lot of actors who've lent their talents to the show and then moved on. Here's what they've been up to.
