The momentous season that changed NCIS forever. In Season 19, legendary Special Agent Leroy Jethro Gibbs (Mark Harmon) unexpectedly retires and is replaced by former FBI agent Alden Parker (Gary Cole). Parker is instantly put to the test as the team takes on a series of life-and-death cases. A bioterror attack exposes Jimmy (Brian Dietzen) and Kasie (Diona Reasonover) to a deadly toxin. McGee's (Sean Murray) mother-in-law is targeted by a killer. Vance's (Rocky Carroll) daughter is kidnapped by a cartel. Torres (Wilmer Valderrama) confronts danger and an old love from his undercover past. New agent Jessica Knight (Katrina Law) risks her life to investigate a true crime podcast. To top it off, fan favorite Dr. Ducky Mallard (David McCallum) makes a surprise return.

DVD release of episodes originally broadcast on television. Title from container.

Disc 1.Blood in the water -- Nearly departed -- Road to nowhere -- Great wide open -- Face the strange. Disc 2. False start -- Docked -- Peacekeeper -- Collective memory. Disc 3. Pledge of allegiance -- All hands -- Fight or flight -- The helpers. Disc 4. First steps -- Thick as thieves -- The wake -- Starting over. Disc 5. Last dance -- The brat pack -- All or nothing -- Birds of a feather.