This episode is well-regarded by fans for its focus on character growth, particularly for "Densi" (Deeks and Kensi).

: Throughout the case, Kensi is uncharacteristically cautious about potential exposure. She eventually reveals to Deeks that she is late on her period , sparking a conversation about their future and the possibility of starting a family. By the end of the episode, it is confirmed to be a "false alarm," but the experience shifts Kensi's perspective on motherhood.

The episode begins with the discovery of , who is found dead in an alley after departing the USS Allegiance . The investigation takes a terrifying turn when it is revealed that she was infected with Ebola .

: Special Agents G. Callen and Sam Hanna are already on the ship when it is placed under strict quarantine. They work alongside Agent Afloat Ehsan Navid (a returning character from Season 5) to identify potential spies or infected crew members.

: In Los Angeles, Kensi Blye and Marty Deeks track Grant’s final movements. They discover that a group of extremists kidnapped Grant to use her as a "human bomb" to spread the virus at a VA hospital .

: While Hetty Lange is mentioned as being on a mission in Washington, D.C., she only appears in credit during this episode. Cast and Production "NCIS: Los Angeles" Yellow Jack (TV Episode 2019) - IMDb

In , titled "Yellow Jack," the team faces a race against time to contain a potential biological catastrophe. This episode, which originally aired on October 20, 2019 , combines a high-stakes medical mystery with significant personal developments for the core characters. Plot Summary: The Ebola Crisis