NCIS, now in its 20th season, is a long-running and beloved drama series about a team of special agents working for the Naval Criminal Investigative Service. The show, set in Washington, D.C., follows the agents as they investigate any criminal activity involving the U.S. Navy, U.S. Marine Corps, and their families. Over the years, numerous interesting stories have emerged regarding the show's production, casting, and behind-the-scenes happenings.