CALLEN AND SAM TRAVEL TO THE USS ALLEGIANCE IN THE PERSIAN GULF TO WORK WITH NAVY CAPTAIN HARMON RABB, JR. WHEN THE NCIS TEAM UNCOVERS ISIS SYMPATHIZERS WHO ARE TARGETING MILITARY LOCATIONS, ON "NCIS: LOS ANGELES," SUNDAY, MAY 12

David James Elliott Guest Stars as Navy Captain Harmon "Harm" Rabb, Jr.

"The Guardian" - Callen and Sam travel to the USS Allegiance in the Persian Gulf to work with Navy Captain Harmon "Harm" Rabb, Jr. (David James Elliott)
when the NCIS team uncovers ISIS sympathizers who are targeting military locations, on NCIS: LOS ANGELES, Sunday, May 12 (10:00-11:00 PM, ET/PT) on the CBS Television Network.

REGULAR CAST:

Chris O'Donnell (Special Agent G. Callen)
LL COOL J (Special Agent Sam Hanna)
Linda Hunt (Henrietta "Hetty" Lange)
Daniela Ruah (Special Agent Kensi Blye)
Eric Christian Olsen (LAPD Detective Marty Deeks)
Barrett Foa (Tech Operator Eric Beale)
Renée Felice Smith (Intelligence Analyst Nell Jones)

GUEST CAST:

David James Elliott (Navy Captain Harmon "Harm" Rabb, Jr.) Mercedes Mason (DEA Agent Talia Del Campo)
Sprague Grayden (Olivia Baird)
Michael Roark (Michael Baird)
Rene Moran (Calvin Sims)
Nadine Ellis (Navy Lieutenant Commander Quinn)
Elena Tovar (U.S. Forest Ranger Vanessa Aguilar)
Carl Chao (NCIS Special Agent Afloat Brian Lee)

WRITTEN BY: R.Scott Gemmill

DIRECTED BY: John P. Kousakis