NCIS: Los Angeles will fight to defend The Talk's Julie Chen during "In the Line of Duty."

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The Talk host will trade the safety of her daytime chat show for a place in the turbulent world of NCIS: LA. Chen will portray U.S. Ambassador Nancy Kelly in episode 11, and her new persona will become key to one of Hetty's investigations when she escapes a terrorist attack at the U.S. consulate in Tunisia.

Callen and Sam will return to the scene of the crime in order to collect vital evidence, but their risky mission will fail to reveal the whole picture. The team will then need to rely on Chen's memory in order to track down the villain behind the attacks.

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Penned by Tim Clemente ("Free Ride," "Blood Brothers") and directed by Karen Gaviola ("Merry Evasion," "Rude Awakenings: Part 2"), "In the Line of Duty" will feature appearances by Don Franklin, Joe Nieves, Maz Siam, Paul Tassone, Jay Pickett, Delpaneaux Wills, Neil Arnote, Tory Berner.

Scroll through the photos above and click the video below to get a look at the upcoming episode.

NCIS: LA airs Mondays at 10 p.m. ET on CBS.