The exploits of the Los Angeles–based Office of Special Projects (OSP), an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments.
LL Cool J
Eric Christian Olsen
Henrietta "Hetty" Lange
The team helps a former NCIS tech operator search for her missing ex-partner, whom they fear might be working with the gun runners they failed to take down years ago; Deeks reels when his bar gets a negative review.
Callen and Sam are trapped in an armed submarine that terrorists have aimed to hit an aircraft carrier in San Diego. Meanwhile, Hetty defies orders and forgoes her trip to Washington, as the team tries to locate and save Callen and Sam and prevent the terrorist attack.
The fourth season of NCIS: Los Angeles premiered on September 25, 2012 on CBS and January 6, 2013 on Sky 1.
The third season of NCIS: Los Angeles premiered on September 20, 2011. The two hours season finale was aired on May 15, 2012 on CBS.