S12, EP11 "Russia, Russia, Russia"
When Callen goes to the National Counterterrorism Center on the pretext of interrogating a Russian asset from the crashed plane case he investigated months earlier, the tables are turned and he is accused of being a Russian agent.
S12, EP9 "A Fait Accompli"
An organized crime leader tries to buy stolen defense technology; Deeks is kicked out of NCIS training only to find that Hetty has a life-changing surprise for him.
S12, EP8 "Love Kills"
When the team investigates the murder of a man about to reveal the source of a counterfeiting operation, an old acquaintance becomes their prime suspect and reveals the true reason for her return; Deeks struggles during training.
S12, EP7 "Overdue"
The NCIS team's murder investigation of a man who sold military information leads to the abduction of a doctor whose cutting-edge neurotechnology could be developed into advanced weaponry; Callen tries to have an important talk with Arkady.
S12, EP5 "Raising the Dead"
In order to get intel on a matter of national security, Kensi must come face-to-face with a sociopath who has been obsessed with her since she put him in jail years ago; Eric is desperate to keep Kensi safe, but he is forced to leave NCIS.
S12, EP4 "Cash Flow"
The body of a murdered Navy reservist is found by thieves in the midst of a robbery, and NCIS must work with the burglars to find the killer; Kensi and Deeks struggle to decide if they are ready to make the leap and buy a house.
S12, EP3 "Angry Karen"
Nell sends Sam to meet an informant who plans to blow the whistle on a military secret; Kensi and Deeks debate whether or not to buy their first house.
S12, EP2 "War Crimes"
The NCIS team is called to help find the missing star witness in the trial of a chief petty officer who Callen and Sam arrested for war crimes.
S12, EP1 "The Bear"
When a Russian bomber goes missing while flying over U.S. soil, Callen and Sam must track it down in the desert and secure its weapons and intel before the Russians on board destroy the plane; Hetty gives Nell a cryptic assignment.