Pictured: LL COOL J (Special Agent Sam Hanna), Lawrence Kao (John Stikler), Eric Christian Olsen (LAPD Liaison Marty Deeks), Chris O'Donnell (Special Agent G. Callen) and Daniela Ruah (Special Agent Kensi Blye). Sam is convinced that the theft of software for a new unmanned aerial vehicle is connected with the disappearance of the lead engineer's 10-year-old daughter, a girl Sam once provided protection detail for in Saudi Arabia, on NCIS: LOS ANGELES, Tuesday, April 29 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Ron P. Jaffe/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.