THE NCIS TEAM INVESTIGATES THE APPARENT SUICIDE OF A SUSPECTED PENTAGON SPY, ON "NCIS," TUESDAY, APRIL 18

Academy Award and Emmy Award Nominee Nina Foch ("Back When We Were Grownups") Returns as Ducky's Mother

"Untouchable" -- Gibbs and the team are called in when a Pentagon cryptographer suspected of spying apparently commits suicide, on NCIS, Tuesday, April 18 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Leslie Libman directed the episode from a script by George Schenck and Frank Cardea.

Academy Award and Emmy Award nominee Nina Foch ("Back When We Were Grownups") reprises her role as Ducky's eccentric, elderly mother.

With their prime suspect dead, the NCIS team must uncover whether or not she was the Pentagon's mole. The team quickly discovers evidence that indicates the young woman was not alone when she died. Now faced with a potential murder, Gibbs and the team follow the clues left behind to find her killer and expose the mole.

NCIS Special Agent Leroy Jethro Gibbs: Mark Harmon
NCIS Special Agent Anthony DiNozzo: Michael Weatherly
Dr. Donald "Ducky" Mallard: David McCallum
Abby Sciuto: Pauley Perrette
NCIS Special Agent Timothy McGee: Sean Murray
Ziva David, Mossad Liaison: Cote de Pablo
NCIS Director Jenny Shepard: Lauren Holly
Jimmy Palmer: Brian Dietzen
Mrs. Victoria Mallard: Nina Foch
Navy Capt. Kevin Dorn: Scott Paulin
Navy Lt. Keira Napleton: Kimberlee Peterson
Ron Levinson: Mark Harelik
Secret Service Officer Jack Lyon: Jonathan Fraser
NCIS Tech: Adria Dawn

RATING: To Be Announced