When did NCIS Season 4 Episode 21 air?
NCIS Season 4 Episode 21 aired on April 24, 2007 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.

Director Shepard makes a huge mistake by meeting a man alone to inform her about La Grenouille, as their meeting turns into a murder of the informant. Now the NCIS team must gather all the existing info and try to finally hunt down their enemy.
Direct answers for episode-level questions and details.
NCIS Season 4 Episode 21 aired on April 24, 2007 at 8 PM ET.
This episode runs for approximately 44 minutes.
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