NCIS is known as an American television series, based on police action and crime-fighting. The show centers around a team of special agents who will stop at nothing to bring the bad guys to book. These agents are part of the Naval Criminal Investigative Service. The first time the concept of NCIS was used, was in a CBS series titled "JAG." The series is based on three main genres known as Drama, Action and Thriller. It was also brought to life by co-creators, Donald P. Bellisario and Don McGill.