A nuclear scientist becomes involved in an extortion plot when a gang threaten to explode a small nuclear weapon somewhere in Honolulu.

Wo Fat returns to Hawaii in order to have a Chinese diplomat whom he classes as a foolish peace-maker assassinated.

A Honolulu murder is mysteriously linked to a human fossil smuggled out of China in the Second World War.

A British agent, Harry Wells, arrives in Hawaii in pursuit of a turncoat, but not all is what it seems for Five-O...

A road accident starts the trail towards a plot to use SAM missiles to bring down a VIP jet plane.

The son of a Japanese businessman is kidnapped and held in a capsule underwater until a $1.5 million dollar ransom is paid...

Two seemingly unconnected deaths lead McGarrett into a desperate race to prevent the assassination of a visiting Sheikh.

When a sea-freighter is hijacked, the wealthy millionaire owner calls in Five-O, but all is not how it seems...

When a Russian tennis star wants to defect, McGarrett must work to prevent an international incident.

When an Asian ex-leader dies in a seemingly accidental swimming incident, his wife is convinced that he was murdered by forces from their home country.