NCIS follows the cases of the Naval Criminal Investigative Service Major Case Response Team. These agents handle any cases relating to the U.S. Navy or Marine Corps and it is often their duty to stop the many threats against them. Many could consider it a pleasing blend of CSI and JAG. The team consists of several "unique" individuals. Leroy Gibbs leads the special team with an iron fist. He is an aggressive agent who always finishes the jobs that he is given. Anthony DiNozzo is the infamous, womanizing Senior Agent who is Gibbs right hand man. Tony tends to get distracted easily, but he is as loyal as they come. Ziva David is a Mossad agent who was assigned to NCIS after she proved her value in several cases invovling a rogue Mossad agent. Timothy McGee is the nerdy computer techician who handles all of the team's technology based needs. He is eventually promoted to a full-fledged field agent. Abigail Sciuto is the forensic's specialist who is known for her gothic style. Donald "Ducky" Mallard is the team's medical examiner who conducts all the autopsies with a sense of eccentric British humor. Jennifer Shepard is the Director of NCiS in the fourth season. She was once Gibbs' partner and their work realtionship is complicated by a fling that they once had on a mission. This amazing mix of characters forms a great base for the show. The interesting cases and characters provides unceasing entertainment for the show's loyal audience.