7. NCIS / NCIS: Los Angeles / NCIS: New Orleans
NCIS covers different aspect of crimes compared to other cop shows. As it stands for Naval Criminal Investigative Service, the premise of the show is a team solving murder case related to the marine.
The show started back in 2003. It was rumored to end in its 10th season, but it is still keep going until today on its 15th season. There were a few changes in the casts, but the main characters remain the same.
Mark Harmon, who is starring the show as Leroy Jethro Gibbs, is also one of the producers of the show and other NCIS series, NCIS: New Orleans. Sometimes, the two shows cross over. Mark Harmon is paid $500,000 per episode.
Another branch of the show is NCIS: Los Angeles starring Chris O’Donnell and LL Cool J. The three NCIS series are still on going up until today.