THE FIRST FOUR ACTION-PACKED SEASONS! Join the complex cast of characters who make up the team on NCIS (Naval Criminal Investigative Service). Led by Leroy Jethro Gibbs (Mark Harmon), this crew of special agents features memorable characters who possess as much quirkiness as they do skill. Joining Special Agent Gibbs are goth forensic scientist Abby Sciuto (Pauley Perrette), former Secret Service operative Caitlin Todd (Sasha Alexander), and Chief Medical Examiner Dr. Donald Mallard (David McCallum). Introduced later is NCIS Director Jenny Shepard (Lauren Holly), with whom Gibbs has a complicated romantic history. Own Seasons 1-4 of NCIS and experience the amusing dynamic of its colorful cast, accompanied by the action and drama of Naval criminal investigations.