There is one NCIS guest star who has made more appearances in the series than some of its regular characters. As the show prepares for its 22nd season, it continues to build on 21 years of television success. While the NCIS franchise has explored various offshoots, none have matched the longevity of the flagship series. One reason for the show’s enduring popularity is its ensemble cast, which keeps the series fresh and exciting. Although the most memorable characters are usually series regulars, NCIS occasionally features guest stars who leave a significant impact.
Some supporting cast members have made a more substantial mark on the series than regular characters. Given the show’s long run, it is unsurprising that some supporting characters have had a more enduring presence than others. These supporting roles often include vital NCIS team members, spouses, former colleagues, and mentors. Notably, one guest star has appeared so frequently that their presence surpasses that of several regular cast members, making it a remarkable achievement.