NCIS: The Twentieth Season [DVD]

Debuting in 2003, this CBS crime drama focuses on a government agency assigned to investigate cases involving Navy and Marine Corps. Personnel from outside the military command structure. Led by seasoned investigator Jethro Gibbs (Mark Harmon), the team also includes former homicide detective Tony DiNozzo (Michael Weatherly), ex-secret service agent Caitlin Todd (Sasha Alexander), forensics expert Abby Sciuto (Pauley Perrette), and medical examiner "Ducky" Mallard (David McCallum).