As of 2015, notable members of the NCIS cast include Mark Harmon, Michael Weatherley, Pauley Perrette, David McCullough and Sean Murray. These cast members represent the stars of the show. All but Sean Murray have played a role in all 281 episodes of the show to date.
NCIS features Mark Harmon as the character Special Agent Leroy Jethro Gibbs. This character has been married three times and has an extensive military background, including positions such as U.S. Marine scout sniper, Gunnery Sergeant and military police officer. Gibbs is described as a skilled investigator and interrogator with infallible intuition.
Another main character in NCIS is Abby Sciuto, played by Pauley Perrette. Scuito is the resident forensic scientist. This character's personality is in opposition to traditional ideas of geeky scientists: she enjoys caffeine-riddled fruit drinks, snaps selfies with her lab equipment and names her computers and machines.
Michael Weatherley plays Special Agent Anthony DiNozzo, or Tony. Tony is a former Baltimore police officer and film buff. A notable attribute is his compulsion to remind the other characters about different movies and plot scenarios. This character is also somewhat of a playboy. His love life is often the recipient of much ridicule. On the contrary, he is very discreet about his financial affairs.