Original air date: 09/29/2019 Runtime: 41:30 min. Callen and Sam work with Navy Capt. Harmon Rabb, Jr. (David James Elliott) to apprehend spies aboard the USS Allegiance. Also, Hetty partners with Marine Lt. Col. Sarah "Mac" Mackenzie to neutralize a missile attack in the Middle East, and Kensi and Deeks are trapped in a mobile CIA unit in Iraq while under attack by ISIS.
Original air date: 10/06/2019 Runtime: 43:03 min. Faced with multiple cases worldwide, the NCIS team splits up, with Callen and Sam working with Mossad Agent Eliana Sapir (Natassia Halabi) in Tel Aviv, and Kensi partnering with DOJ Agent Lance Hamilton (Bill Goldberg) in Los Angeles.
Original air date: 10/20/2019 Runtime: 42:39 min. While Callen and Sam are aboard the USS Allegiance, the ship is placed under quarantine for possible Ebola exposure. Also, Kensi and Deeks investigate the murder of a petty officer who recently departed the USS Allegiance and is linked to the Ebola exposure.
Original air date: 11/03/2019 Runtime: 41:08 min. The NCIS team reluctantly aligns with two former criminals from England, Ricky Dorsey (Vinnie Jones) and Frankie Bolton (Steve Valentine), after a powerful arms dealer kidnaps Ricky's daughter in an attempt to obtain a dangerous weapons system.
Original air date: 11/10/2019 Runtime: 43:01 min. The NCIS team links the theft of an undersea drone prototype to a video game streamer's elaborate party. Also, Callen and Sam cross paths again with insurance broker Katherine Casillas (Moon Bloodgood), who insures the gamer's property and processions.
Original air date: 12/08/2019 Runtime: 42:15 min. While the team investigates the theft of a computer virus, Callen and Sam consider their future at the agency, Kensi and Deeks discuss having children, and Eric and Nell analyze the impact of Eric's undercover assignment on their relationship. Also, the team tracks Mara (Arielle Vandenberg), a crooked upscale banker.