Stars of "NCIS" include Mark Harmon, Michael Weatherly and Pauley Perrette. As of May 2015, each of them has played a main character and appeared in more 275 episodes of the show.
Mark Harmon plays NCIS agent Leroy Jethro Gibbs, a role which he first played as a guest star on "JAG" before becoming a star in its spinoff, "NCIS." Harmon was born on Sept. 2, 1951, and was the starting quarterback for the UCLA Bruins in 1972 and 1973. He became an actor after college, appearing in many television shows and films. He has received multiple nominations for Primetime Emmy Awards and Golden Globes.
Michael Weatherly plays Anthony DiNozzo. Weatherly was born on July 8, 1968, and left college to pursue his acting career. His first roles were as a guest star on television shows such as "The Cosby Show." He has appeared in many television shows and films, including "The Specials" and "Gun Shy."
Pauley Perrette plays Abby Sciuto, a role which she also first played as a guest star on "JAG." She was born on March 27, 1969, and studied criminal justice in college. Her first acting roles were in commercials, music videos and short films. She is also a writer and a singer.