An experimental Naval aircraft crashes on Oahu, and Jane Tennant and her team must find who is behind it before classified state secrets are exposed.

Tennant and NCIS must take down a notorious team of international thieves using WWII explosives on armored trucks before they complete their final big job and disappear. Lucy and Whistler have a standoff about their previous encounter; and Ernie's mission in the field is more alarming than he expected.

Kai goes undercover with one of Hawai'i's oldest surf gangs when a petty officer who's trying to help wayward kids find a new path in the Marines is murdered.

When a marine is shot, the team investigates. They start by talking to him, he tells them that he went riding and he got shot probably by a hunter. They check out his story and learn he wasn't telling the truth. They go back to see him but he left the hospital, not fully healed. They learn a relative came and helped him. They see the relative, who doesn't know much but they find a bag filled with drugs. They think the bag belongs to his son. So they try to talk to him but he disappeared. They think the boy was asked by a drug ring to deliver the drugs but he changed his mind which means his father is trying to protect him. But the gang will stop at nothing to get them, so they try to find them. When Kai's father doesn't see his doctor, Kai needs to put aside his feelings to help his father.

A Japanese sailor is killed and evidence links the case to the murder of the victim's girlfriend back in Japan, NCIS must find the murderer before the wrong person is accused and the case triggers a diplomatic crisis.

The wife of a naval weapons Officer disappears. The team investigates and find the man who took her, dead. She left the vicinity around the time the man was killed. They look into her background but Whistler tells them to back off. Tennant relents and with the info they have, she deduces the wife works for the CIA. They find her but her husband gets taken. Whistler wants to take her but to save her husband, they need her.

When a Navy petty officer is murdered, Jane and the team investigate while protecting the victim's friend and colleague.

When an anti-capitalist protestor is murdered, Jane and the team investigate and find themselves caught in a war between eco-activists and a tech billionaire fighting over a piece of land. Also, Jane and Captain Joe go on a date.

The NCIS team investigates a cold case involving WWII-era bones on the 80th anniversary of the Pearl Harbor bombings, and are shocked to learn they belong to a 100-year-old survivor of the attack.

NCIS crosses paths with Whistler's team while investigating a shipping container filled with contraband weapons. Also, Tennant debates arresting Alex's friend's dad, knowing it will cause his friend to move away

Evidence to put away a drug kingpin is stolen, Lucy goes undercover at an underground poker tournament to find out which high-roller is behind the crime. Lucy's feelings are in turmoil when Whistler's ex-girlfriend arrives in town.

NCIS team investigate the mysterious death of Navy engineer Joseph Chan, learning that the last person he met with was Maggie Shaw - Jane's mentor and friend, who has since been kidnapped. David Sola, a New Zealand intelligence officer who arrives in Hawai'i to follow a lead in a case that connects Joseph's death to a Chinese black op.

While Tennant investigates Maggie's kidnapping, she learns the shocking truth about her friend's past. She gets help from her team to prove what she found out is true.

Jane Tennant faces interrogation about her friendship with a CIA mole. Her team investigates an ultrasonic attack on a Marine team, the only victims at a crowded beach. Whistler has a new job that brings her into contact with Lucy again.

As Jesse enjoys a day sailing with his daughter, Gracie, pirates suddenly seize their yacht, take all the passengers hostage and attack Jesse, leaving it up to his team to quickly locate and rescue his daughter.

Kai goes undercover as a chef in a local restaurant to gather intel on a notorious criminal kingpin who has a connection to the eatery.

When a ransomware attempt causes a dam to malfunction, Ernie and a team of hackers are tasked to find the culprit quickly, before all power and water is cut off on the island. Also, Lucy and Whistler work together, giving Whistler a chance to apologize to Lucy and mend their relationship.

NCIS Agents Nick Torres and Jessica Knight travel to Hawai'i when they learn a key witness in one of their old cases has turned up there with crucial evidence.

NCIS team investigates a shipwreck carrying exotic animals that now threaten the native wildlife on Oahu. Alex sustains a career-ending injury and Kai asks Melanie, a fish and wildlife agent, out on a date.

When a navy seaman is involved in a murder, the NCIS team is called to work the case on their day off. Also, Lucy finds out Whistler turned down a promotion in D.C. to stay in Hawai'i.

Captain Milius returns to Hawai'i for a secret prisoner exchange operation, and brings in Jane to be his personal security escort in the Philippines, where the exchange will take place.

Captain Milius continues to work with Tennant and her team in the aftermath of the prisoner exchange between U.S. and eastern Europe. Also, Whistler takes Ernie's advice and makes a grand gesture in the hope of winning back Lucy. First season finale.

Special Agent Tennant's team, along with NCIS agents Nick Torres and Jessica Knight, learn about plans for an attack in Oahu on RIMPAC (Rim of the Pacific); the world's largest international maritime warfare exercise.

The team's investigation leads to the world of illegal street racing after a Marine staff sergeant's body is discovered in a junkyard. Tennant's concerned Alex is hiding something from her, Whistler is anxious about introducing Lucy to her co-workers.

Tennant and the NCIS team suspect foul play when they investigate a fatal car crash involving a Navy officer who turns out to be an impostor. Whistler finds herself in danger when she goes undercover to learn the truth behind the accident.

When a Navy sailor washes up dead in a sacred, forbidden kapu site, the NCIS team brings CGIS Special Agent Pike to unmask the mystery and catch a possible serial killer on the island. Also, Tennant meets Alex's new girlfriend.

The NCIS team investigates the death of a Navy sailor and goes head-to-head with a ruthless local criminal organization. Also, Lucy looks for a new apartment.

A Marine Corporal dies in a tide pool after being exposed to fentanyl, the NCIS team must quickly find the source of the drugs. Alex talks to his parents about taking a gap year and Ernie reveals personal news to Lucy.

When the mother of a young boy goes missing, the NCIS team sets out to find him and learns they aren't the only ones searching for him

A naval officer is murdered while moonlighting in community theater, the NCIS team recruits a familiar face to help lead them to a ruthless international killer. Kai enlists Whistler to investigate an old friend turned criminal.

Commander Chase is abducted from her home by an Army Ranger accused of murder, the NCIS team must act quickly to find her.

In Washington D.C. to celebrate the retirement of a former professor. NCIS agents are forced to investigate the professor's suicide. Tennant, Jimmy Palmer and Sam Hanna are kidnapped, and it all ties into the mysterious suicide.

When Special Agent Pike is ambushed while working undercover with a local Japanese crime family, the team must find the person responsible for orchestrating the attacks.

When an elite special forces Marine captain is murdered, the NCIS team finds a suspect in a really unusual place.

Following a close call at a meth lab explosion, the NCIS team learn one of their own is being targeted. Lucy gets her first big case aboard her aircraft carrier.

When the murder of a captain and his wife echoes a previous case, the NCIS team brings in a former team member to help determine if they are dealing with a copycat killer.

A Navy deserter accidentally comes out of hiding, his family becomes a target that drives the NCIS team and Charlie 1 to investigate who is after them. Lucy surprises the team by returning to Hawai'i from her agent afloat job early.

When some Naval Officers are the victims of a prank the team investigates. They suspect they are dealing with someone who commits petty thefts and posts them. They eventually learn a Naval aviator might be connected to their target and learn its his son. Later the father is attacked and they wonder why? Whistler is trying to get a CI to fulfill his end of their deal but the Guy is asking for something Whistler cant give. And their op might not Go through. And Alex informs Tennant he made a life changing decision.

Milius returns and asks Tennant to protect a girl who has info on a arms dealer the FBI and DOD want to arrest. Kai and Jesse are assigned and all she does is shop but it seems apparently That she has something else in mind. Kai tries to reason with her. Milius also reveals he was the one who got Alex into Annapolis. So he meets with her and Daniel which causes tension.

When Tennant interrogates a suspect during his helicopter transfer and the helicopter crashes, she must utilize her skills to save herself and the other passengers.

After the mysterious death of an astronaut in a highly sensitive Mars simulation, the NCIS team must send Ernie into the habitat to investigate alone.

When Lucy receives a strange call on night watch from a man admitting to murder, the NCIS team sets out to find him.

The discovery of a dead former MI6 agent uncovers secrets from Tennant's past, forcing her to go to extreme lengths to track down the responsible party.

The discovery of a dead former MI6 agent uncovers secrets from Tennant's past, forcing her to go to extreme lengths to track down the responsible party.

Having passed medical and psych evaluations, Tennant is surprised to see Sam conducting her final interview to clear her return to work. Following a breach in the US Marshal's database, Sam joins Tennant in Las Vegas to locate the hacker.

After the mysterious death of an astronaut in a highly sensitive Mars simulation, the NCIS team must send Ernie into the habitat to investigate alone.

When a ransomware attempt causes a dam to malfunction, Ernie and a team of hackers are tasked to find the culprit quickly, before all power and water is cut off on the island. Also, Lucy and Whistler work together, giving Whistler a chance to apologize to Lucy and mend their relationship.

Commander Chase is abducted from her home by an Army Ranger accused of murder, the NCIS team must act quickly to find her.

Jane Tennant faces interrogation about her friendship with a CIA mole. Her team investigates an ultrasonic attack on a Marine team, the only victims at a crowded beach. Whistler has a new job that brings her into contact with Lucy again.

NCIS Agents Nick Torres and Jessica Knight travel to Hawai'i when they learn a key witness in one of their old cases has turned up there with crucial evidence.

Tennant and NCIS must take down a notorious team of international thieves using WWII explosives on armored trucks before they complete their final big job and disappear. Lucy and Whistler have a standoff about their previous encounter; and Ernie's mission in the field is more alarming than he expected.

Special Agent Tennant's team, along with NCIS agents Nick Torres and Jessica Knight, learn about plans for an attack in Oahu on RIMPAC (Rim of the Pacific); the world's largest international maritime warfare exercise.

A Marine Corporal dies in a tide pool after being exposed to fentanyl, the NCIS team must quickly find the source of the drugs. Alex talks to his parents about taking a gap year and Ernie reveals personal news to Lucy.

When Tennant interrogates a suspect during his helicopter transfer and the helicopter crashes, she must utilize her skills to save herself and the other passengers.

NCIS team investigates a shipwreck carrying exotic animals that now threaten the native wildlife on Oahu. Alex sustains a career-ending injury and Kai asks Melanie, a fish and wildlife agent, out on a date.