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.

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.

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

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.

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.

La comandante Chase es secuestrada de su hogar por un Ranger del Ejército acusado de asesinato, el equipo de NCIS debe actuar rápidamente para encontrarla.

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.

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.