- IMDb: NCIS
 - Cast overview and links for the CBS show NCIS starring Mark Harmon and Sasha Alexander. - NCIS
- Official site for NCIS, the CBS action drama series about the Naval Criminal Investigative Service, a special team of agents who handle crimes with ties to the Navy and the Marines. Starring Mark Harmon.
- TV.com: NCIS
- Background on the TV drama NCIS, starring Mark Harmon. Find episode guides and more.
- Yahoo! TV: NCIS
- Photos, episode guides, message boards, and more for NCIS, the JAG spin-off on CBS starring Mark Harmon and Lauren Holly.
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