- Sean Murray (Timothy McGee)
- Wilmer Valderrama (Nick Torres)
- Katrina Law (Jessica Knight)
- Brian Dietzen (Jimmy Palmer)
- Rocky Carroll (Leon Vance)
- Diona Reasonover (Kasie Hines)
- Gary Cole (Alden Parker)
NCIS — S9E17
Episode: Need to Know
Air Date: 2012-02-28
Runtime: 41 min
Overview
Top-secret clearance from a Naval research laboratory is jeopardized when the murder of a Chief Petty Officer is connected to an international arms dealer.