From Donald P. Bellisario comes NCIS, a show bringing us the inner workings of the government agency that investigates all crimes involving Navy and Marine Corps personnel, regardless of rank or position. From murder and espionage to terrorism and stolen submarines, these special agents traverse the globe to investigate all crimes with Navy or Marine Corps ties. Leading this team that operates outside of the military chain of command is Special Agent Leroy Jethro Gibbs (Mark Harmon), a skilled investigator and interrogator who is smart, tough and willing to bend the rules to get the job done. Working under Gibbs is Special Agent Tony DiNozzo (Michael Weatherly), a former homicide detective who has instincts that can come only from working on the streets. Joining them is Abby Sciuto (Pauley Perrette), a gifted forensics specialist whose dark wit matches her goth-style hair and clothes, and Dr. Donald "Ducky" Mallard (David McCallum), a medical examiner. Through season one a new character has been introduced -- special agent Tim McGee (Sean Murray, "The Random Years") whose computer skills will be a very big part of the NCIS team. Special Agent Caitlin "Kate" Todd (Sasha Alexander, "Dawson's Creek"), a former United States Secret Service agent, has brought her intelligence and gutsy personality to the team through first 2 seasons, until during her duty in season two finale, when she was murdered by a terrorist. In season three, the NCIS team welcomed Mossad Agent Ziva David (Cote de Pablo), who took Kate's place in the team, and the NCIS team got a new director, Jenny Shepard (Lauren Holly).