Protect and Serve with the NCIS Cast Members

Mark Harmon plays special agent Jethro Gibbs and is one of the stars of the show, if not the main star of the show having acted in all 186 episodes. He was previously one of the stars of the television series "Chicago Hope" and has been acting in a wide variety of film and television shows and TV movies since 1973.

Michael Weatherly. "NCIS" cast member Michael Weatherly plays special agent Anthony DiNozzo and is another one of the stars of the show having acted in all 186 episodes. He has been a regular on a number of different television series before landing the role on "NCIS," like "Ally McBeal" and "Dark Angel." His same character was actually a character on another popular series called "Jag" a few years before.

Pauley Perrette. "NCIS" cast member Pauley Perrette plays Abby Sciuto on the show and is another one of the stars of the show, having acted in all 186 episodes. She has acted in a wide variety of film and television, ranging from a role in the film  "Almost Famous" to television series like "Dawson's Creek" and "24."

David McCallum. "NCIS" cast member David McCallum plays Dr. Donald Mallard and is another one of the stars of the show, having acted in all 186 episodes. He has been in a number of other television series like "The Replacements" and "The Education of Max Bickford."

Sean Murray. "NCIS" cast member Sean Murray plays special agent Timothy McGee and is one of the stars of the show, having acted in 171 episodes. He has also been a star of other television series like "Harts of the West" and "Jag."

-Eli Kooris