Pictured: Eric Christian Olsen (LAPD Liaison Marty Deeks). When Callen and Sam are tasked with apprehending a spy contracted by the CIA, Sam is shot and the team enlists the help of Thapa, the elite Nepali soldier from their past, to help to find the shooter. Also, Kensi and Deeks have their first official argument, on NCIS: LOS ANGELES, Monday, Feb. 23 (9:59-11:00 PM, ET/PT) on the CBS Television Network. Ernie Reyes, Jr. returns as Thapa and Parminder Nagra guest stars as the spy. Photo: Sonja Flemming/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved.