Callen finds himself detained under the pretense of being a Russian agent subsequent to questioning a Russian asset about an old case.

Hetty makes a cryptic message for Callen before he looks for the person who has been tailing him, which leads him to an isolated location rife with Russians.

Callen and NCIS are forced to use Anna to attract Katya and save Joelle; Callen learns the identity of the person who accused him of being a Russian asset.

The team tries to stop a group of people from Anna's past to force her back to Russa; Nell is presented with a serious offer from Admiral Kilbride.

The team searches for technology that was used to produce a realistic deep fake video, but their communications are hijacked by a concerning suspect.

A deaf engineer who survived the theft of military-grade technology works with the NCIS team to find what was stolen before it is exported.

The team works with Joelle to investigate a Naval Intelligence Officer's murder; the sociopath obsessed with Kensi decides to send her a threatening postcard.

Kirkin's associate decides to kidnap Deeks out of a need for his help while the team investigates a militarized dolphin that was shot.

Four months after being shot, a federal agent with a legendary undercover reputation returns to the office to help his team solve a kidnapping case.

As the team investigates the murder of a drug dealer, Special Agent Hanna discovers that members of his former Navy SEAL team may be involved.