When Wo Fat steals toxins in an attempt to take out the leaders of Communist China, McGarrett must track him to Hong Kong.

In Hong Kong, Steve is caught by Wo Fat and mentally and physically tortured by being 'reconditioned'. He must beat these problems to save the day again.

The murder of island prostitutes seems to be linked to an extortion racketeer who is determined to make a return...

Five bodies are found in the crater of Mauna Loa contaminated by radiation from illegal plutonium, and Five-O must find and confiscate this deadly toxin.

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

A masterful forger plans a massive robbery of Navy funds, and McGarrett is made to look rather inept...

When yacht racers are found dead on their craft, Five-O launches a desperate search for high-seas buccaneers.

A escaped convict may well have a strong case of innocence, when Five-O become involved in the paranormal...

A press photographer is pursued relentlessly after she takes a photo of a supposedly dead gangster who has returned to the islands to take control of the local syndicate.

When $10 million goes missing from a crimelord, the culprit seems to be dangerously close to home...

Police are being lured into traps and shot, and Five-O have difficulty nailing a suspect when their primary lead turns out to be a paraplegic.

The boyfriend of an overdose victim re-enacts famous film murders in a revenge on all the people he sees as responsible.

McGarrett is the top suspect in the murder of his girlfriend, and the evidence against him is seemingly overwhelming...

Five-O must work with a Japanese officer to find the source of handsguns that are flooding the black market in Tokyo.

The daughter of Attorney General John Manicote is kidnapped by a deranged rapist and murderer, and Steve must not only contend with the criminal but Manicote's emotional state as well...

A hit and run incident leads Five-O to a gambling syndicate and Officer Welles's brother.

A pensioner threatens to blow himself and his hostages up if he doesn't stop the demolition of his home.

A lady singer is kidnapped and it looks as if she and her captors have died at sea.

A gangster attempts to buy an interest in a football club so that he can launder money through it.

While searching for parts from a sunken Soviet submarine, McGarrett become suspicious about the particular parts that are being recovered.

A missing rodeo cowboy and the murder of a young couple pose a puzzling mystery for Five-O.

The daughter of a LA detective and friend of McGarrett is framed for murder and then joins a cult.

A gang of thieves steal army rifles by peculiar means - hang-gliding into the armoury!