The official "NCIS" page of the CBS website contains a full list of all active cast members as of the most current season of the program. Sites such as IMDB.com, TVGuide.com and TV.com also contain lists of active and past cast members.
Each listing on the "NCIS" page on CBS.com includes pictures of the characters as well as a short biography of the actor playing that character. The page also contains videos of recent episodes and highlights of the different characters. Other sections of the site offer features such as episode summaries, news about the show, clips of different episodes and links to social media pages for the show.
IMDB.com contains a comprehensive listing of the full cast and crew for every episode of "NCIS" aired as well as some episodes schedules to air, as they are announced. In the Cast section of this page, listings are organized based on the number of episodes in which the character appears over the course of the show. It also includes links to the actor's page on the site, which shows all of her credits during her career. TVGuide.com lists cast members in two sections, consisting of active cast and former cast members.