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.

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.

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.

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.

El capitán Milius continúa trabajando con Tennant y su equipo tras el intercambio de prisioneros entre Estados Unidos y Europa del Este. Además, Whistler sigue el consejo de Ernie y hace un gran gesto con la esperanza de reconquistar a Lucy. Final de la primera temporada.

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.

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.

Un oficial naval es asesinado mientras trabaja a tiempo parcial en un teatro comunitario, el equipo de NCIS recluta a una cara conocida para ayudarlos a encontrar a un despiadado asesino internacional. Kai recluta a Whistler para investigar a un viejo amigo convertido en criminal.

En Washington D.C. para celebrar el retiro de un antiguo profesor. Los agentes del NCIS se ven obligados a investigar el suicidio del profesor. Tennant, Jimmy Palmer y Sam Hanna son secuestrados, y todo está relacionado con el misterioso suicidio.

Cuando el Agente Especial Pike es emboscado mientras trabaja encubierto con una familia local de crimen japonés, el equipo debe encontrar a la persona responsable de orquestar los ataques.

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

Después de un susto cercano en una explosión en un laboratorio de metanfetaminas, el equipo de NCIS descubre que uno de los suyos está siendo objetivo. Lucy se enfrenta a su primer gran caso a bordo de su portaaviones.

Cuando el asesinato de un capitán y su esposa hace eco de un caso anterior, el equipo de NCIS trae de vuelta a un antiguo miembro del equipo para ayudar a determinar si están tratando con un asesino imitador.

Un desertor de la Marina sale accidentalmente de su escondite, su familia se convierte en un objetivo que lleva al equipo de NCIS y a Charlie 1 a investigar quién está detrás de ellos. Lucy sorprende al equipo al regresar a Hawái de su trabajo como agente flotante antes de lo previsto.

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.

Cuando Tennant interroga a un sospechoso durante su traslado en helicóptero y el helicóptero se estrella, ella debe utilizar sus habilidades para salvarse a sí misma y a los demás pasajeros.