Season four continues the adventures of a cutting-edge crew of special agents who operate outside the government's chain of command. Led by Leroy Jethro Gibbs, this highly trained, tight-knit team travels the world investigating murder, espionage, and terrorism.

Widescreen. Title from container. "CBS DVD"--Container. "Some episodes may be edited from their original network versions"--Container. Originally broadcast on television during the 2006-2007 season.