When did NCIS Season 6 Episode 21 air?
NCIS Season 6 Episode 21 aired on April 7, 2009 at 8 PM ET.


Back in force.
From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has any connection to Navy and Marine Corps personnel, regardless of rank or position.

When a government scientist goes missing, Abby is recruited to carry on his work, but the team worries that she may meet the same fate as her predecessor.
Direct answers for episode-level questions and details.
NCIS Season 6 Episode 21 aired on April 7, 2009 at 8 PM ET.
This episode runs for approximately 44 minutes.
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