he Naval Criminal Investigative Service continues its pursuit of the most difficult military-related crimes for a fourth season. Operating independently of the U.S. military, this elite unit consists of a quirky group of experts who solve cases of murder, espionage, terrorism and more. Team leader Gibbs (Mark Harmon) has retired, but he can't stay away from the action at NCIS as he's pulled back in to help unravel some complicated mysteries.

This 6-disc set includes all 24 action-packed episodes, along with top-notch, behind-the-scenes special features, from this critically acclaimed, one-of-a-kind series.

Episodes:
Shalom
Escaped
Singled Out
Faking It
Dead and Unburied
Witch Hunt
Sandblast
Once a Hero
Twisted Sister
Smoked
Driven
Suspicion
Sharif Returns
Blowback
Friends & Lovers
Dead Man Walking
Skeletons
Iceman
Grace Period
Cover Story
Brothers in Arms
In the Dark
Trojan Horse
Angel of Death