NCIS: Los Angeles season 5

After events in "Descent" Kensi battles ex-Spetsnaz mercenary Maya Yerzov and former Russian policewoman Veronica Pisconov to save Michelle Hanna, who dangles outside a thirty-story building. Michelle climbs up and kills Veronica. Kensi chases Maya, who crashes her motorcycle. Granger convinces Maya she is paralyzed; Kensi cons her for Isaak Sidorov's location. Callen pressures Marcel Janvier to broker with Sidorov and Naseem Vaziri to locate and recover two 1960s-era Soviet 17 megaton nuclear bombs. Kensi and Granger prepare Sam and Marty, who Sidorov tortured. Michelle shoots Sam and Marty (in their vests), feigning loyalty to Sidorov before leaving to collect his gold. Janvier escapes through a shopping mall. Eric and Nell search for the ship containing the nukes; Hetty alerts NEST. Michelle contacts Eric from Sidorov's phone, blowing her cover. Sam and Marty leave the hospital, helping Kensi save Michelle from Sidorov and his henchman, Mikhail Andros. Callen and Granger chase Janvier, who took revenge on his Iranian captor Vaziri. Callen shoots Janvier trying to escape. The NEST team recovers the nukes from the Port of LA. Four months later : Serving two life sentences, Janvier vows to escape and exact revenge on Callen, saying, "The game is not over."

Hetty contacts operational psychologist Nate Getz to help Sam and Deeks come to terms with the torture both men received at the hands of Isaak Sidorov while the remaining members of the OSP investigate the killings of a former Navy Vice Admiral and a controversial journalist on board a private jet.

The team must find who compromised a classified vaccine project from a bio tech company. Meanwhile, Deeks struggles with his emotions upon returning to the field.

While investigating a kidnapping case of a man who claims to be Callen's father, the team soon find themselves in grave danger.

Nell joins the team in the field, after they discover that the ransom demand for a former Navy officer's girlfriend, who has been kidnapped, is intelligence information, while Deeks remains unaware that he has broken one of Hetty's rules.

When a joint FBI/CIA/NCIS raid goes bad, the team suspects a mole. It turns out to be the work of a hacker with evidence leading to a fifteen year-old girl. Realizing the girl's hacking program has been stolen, Callen goes undercover at her private school to find out who is responsible. Ultimately the team captures her bogus male friend, who conned away the girl's hack phone long enough to sell the intel.

The team along with Homeland Security investigate the death of a security guard who worked at a train yard and they soon discover that they're searching for a mastermind who may be planning to launch a terrorist attack on a train.

When a nuclear device goes missing, the team jump into action to find it before it falls into the wrong hands, while Hetty realizes that someone from her past has returned, someone who could very well jeopardize her career. Once they find that person, he admits that he sold the nuclear device to Russia. The episode ends with the team covertly stealing it back from the Russian consulate, almost failing and causing an international incident.

While investigating the death of a Naval officer, Kensi and Deeks go undercover at a rehab center.

Sam and Callen ask a Gurkha for help retrieving a thumb drive. Deeks and Kensi decide to try to find a balance but Kensi is reassigned indefinitely.

Upon discovering that a former Romanian communist leader and suspected war criminal is now living in Los Angeles under a false identity, the team attempt to capture the criminal before he disappears again. Kensi arrives in Afghanistan where she receives her assignment.

A senator's daughter is the victim of a home invasion. The team investigate to determine if it was a random crime or a targeted attack due to her father's crackdown on international cyber warfare. Meanwhile, Kensi's holiday spirit changes after she receives a surprise Christmas gift.

A federal agent tied to hawala, an ancient system of money transfer, is murdered with the resulting investigation reuniting the team in Los Angeles with Kensi and Granger, who are in Afghanistan.

When two private military contractors are murdered, the team's investigation leads them back to one of their unsolved cases (from "Impact") with the search bringing them to a suspect who eventually puts one of their own in grave danger while Sam sets up Callen on a blind date.

Sam and Callen search in Mexico for a diplomatic murder suspect. Nate and Deeks assist the pair from Los Angeles.

Sam and Callen investigate the explosion of a fish market with the help of an undercover DEA Agent Talia Del Campo. In Afghanistan, Kensi and Granger are on the case of a helicopter crash.

The team must find a mole when an undercover agent, later found to be working for the ATF, is killed by a gang. Meanwhile in Afghanistan, Granger is worried when Kensi disappears.

The team must investigate when one of Eric's friends is attacked. In Afghanistan, Kensi sees someone from her past.

The team travels to Afghanistan after learning of Kensi's disappearance.

The team investigates a marine who had embezzled money. Kensi is forced to work with Eric in the Operations Center after returning from Afghanistan, while Nell is teamed with Deeks.

An undercover NCIS agent is taken into custody when he is suspected of working for the smuggler he is supposed to be investigating. Meanwhile, Kensi and Deeks discuss their relationship when she returns to the field.

A ten year-old girl Sam once provided protection detail for in Saudi Arabia goes missing, and he's convinced her disappearance is directly connected to the theft of software for a new unmanned-aerial vehicle being developed by her engineer mother.

An explosion at a military charity event kills a soldier and another man. Thought to be a terrorist attack, the team is tasked to find those responsible.

Angel and Luis "El Conquistador" Morales spew alcohol flames as submarine engineer LCDR. Steven Hill falls from the bridge. His wife Sarah reported him missing for weeks. Autopsy reveals cocaine overdose. From cellphone activity, Eric identifies James Martinez, who they apprehend after questioning Mission Street gang leader Salazar. From engine acoustic signatures, Eric traces the car used to dump Hill to Herrenvolk Brotherhood white supremacist, Michael Wilson. Hetty is assigned administrative leave pending a full investigation of the White Ghost incident, leaving Nell instructions. Wilson throws a grenade, which Sam returns, blowing up Wilson's house, where they discover Jennifer Anderson's corpse. DEA Agent Talia Del Campo informs, Wilson dealt in meth and formed alliances with other gangs. OSP learns Jennifer's husband Charles was extorted to build a submarine by unknown persons. Talia believes Herrenvolk colluded with the Brenasolo Cartel to smuggle Colombian cocaine. Nell traces college student Ali Hanna's car to a San Pedro wet dock rental for ship repair. Exploring the sub, Hanna kills Ahmed shooting at Callen. Rather than drugs, they find it filled with ammonium nitrate explosives. Jabril, Ali, and Yusef prevent their escape as they dive and depart. To be continued...