WHEN A MARINE FALLS ILL DURING A TRAINING MISSION DUE TO AN ATTACK BY A GENETIC WEAPON, THE NCIS MUST TRACK DOWN THE PERSON RESPONSIBLE, ON "NCIS: LOS ANGELES," SUNDAY, NOV. 20

"Survival of the Fittest" - When a Marine falls ill during a training mission due to an attack by a genetic weapon, the NCIS must track down the person responsible for unleashing it. Also, Deeks struggles with balancing work and home life when Rosa comes down with the flu, on the CBS Original series NCIS: LOS ANGELES, Sunday, Nov. 20 (10:30-11:30 PM, ET/PT) on the CBS Television Network, and available to stream live and on demand on Paramount+*.

REGULAR CAST:

Chris O'Donnell (Special Agent G. Callen)
LL COOL J (Special Agent Sam Hanna)
Linda Hunt (Operations Manager Henrietta "Hetty" Lange)
Daniela Ruah (Special Agent Kensi Blye)
Eric Christian Olsen (NCIS Investigator Marty Deeks)
Medalion Rahimi (Special Agent Fatima Namazi)
Caleb Castille (Special Agent Devin Rountree)
Gerald McRaney (Retired Admiral Hollace Kilbride)

GUEST CAST:

Pamela Reed (Roberta Deeks)
Natalia Del Riego (Rosa Reyes)
Dominic Burgess (Herman Cooper)
Piper Curda (Lisa Cho)
Bobby Hogan (Marine Private First Class James Williams)
Cyrus Hobbi (Marine Staff Sergeant Pierce)
Jesse Boone Susan Slome Marcus Antony Brunner (Nicholas "Nick" Embry)
(Jordana Hanson)
(Marine Private First Class Edward Hanson)

WRITTEN BY: Andrew Bartels

DIRECTED BY: Eric A. Pot