Highlights from the Twelfth Episode of Season 3 of NCIS: LA

­When a researcher with the Department of Defense is found dead, Nell must put her high IQ to the test when she goes undercover as his replacement. Meanwhile, Hetty’s ability to lead the team is questioned by the new NCIS Assistant Director, Owen Granger.

Eric Beale

Eric Beale

Tech Operator Eric Beale (Barrett Foa) on NCIS: LOS ANGELES. Photo: Richard Cartwright/ CBS ©2011 CBS Broadcasting, Inc. All Rights Reserved.
Night

Night

LAPD Detective Marty Deeks (Eric Christian Olsen), on NCIS: LOS ANGELES. Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.
Cruising

Cruising

LAPD Detective Marty Deeks (Eric Christian Olsen), and Special Agent Kensi Blye (Daniela Ruah) on NCIS: LOS ANGELES. Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.
Sam Hanna

Sam Hanna

Special Agent Sam Hanna (LL COOL J) on NCIS: LOS ANGELES. Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.
Hot Rod

Hot Rod

Special Agent Sam Hanna's (LL COOL J) and Special Agent G. Callen (Chris O’Donnell) on NCIS: LOS ANGELES. Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.
Special Agents

Special Agents

Special Agent Sam Hanna's (LL COOL J) and Special Agent G. Callen (Chris O’Donnell) on NCIS: LOS ANGELES. Photo: Richard Cartwright/ CBS ©2011 CBS Broadcasting, Inc. All Rights Reserved.
G. Callen, Sam Hanna and Marty Deeks

G. Callen, Sam Hanna and Marty Deeks

Special Agent Sam Hanna's (LL COOL J), Special Agent G. Callen (Chris O’Donnell) and LAPD Detective Marty Deeks (Eric Christian Olsen), on NCIS: LOS ANGELES. Photo: Richard Cartwright/ CBS ©2011 CBS Broadcasting, Inc. All Rights Reserved.
Eric Beale and Nell Jones

Eric Beale and Nell Jones

Tech Operator Eric Beale (Barrett Foa) and Intelligence Analyst Nell Jones (Renée Felice Smith) on NCIS: LOS ANGELES. Photo: Richard Cartwright/ CBS ©2011 CBS Broadcasting, Inc. All Rights Reserved.
Special Agents

Special Agents

Tech Operator Eric Beale (Barrett Foa), Special Agent Sam Hanna's (LL COOL J), Special Agent G. Callen (Chris O’Donnell) and LAPD Detective Marty Deeks (Eric Christian Olsen), on NCIS: LOS ANGELES. Photo: Richard Cartwright/ CBS ©2011 CBS Broadcasting, Inc. All Rights Reserved.

"The Watchers"

A new Assistant Director is assigned to oversee LA operations for NCIS, the team begins to wonder what his intentions really are. (L-R) Chris O’Donnell as Special Agent G. Gallen, LL COOL J as Special Agent Sam Hanna, Eric Christian Olsen as Special Agent Marty Deeks, Daniela Ruah as Special Agent Kensi Blye and Guest star Miguel Ferrer as NCIS Assistant Director Owen Granger. Photo: Richard Cartwright/ CBS ©2011 CBS Broadcasting, Inc. All Rights Reserved.