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.
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Henrietta "Hetty" Lange
Sam negotiates and Rountree goes undercover, when a man takes a busload of hostages and threatens to blow it up unless his daughter’s war crimes are posthumously cleared.
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.