McGarrett and company must pit their wits against a veteran thief and robber who leaves Monopoly money at the scene of his crimes.

When a singer witnesses a murder committed by a racketeer, Five-O has to protect her until she can give evidence, but this is not an easy job...

A Japanese computer research company executive is recognised by a veteran as his former captor in a Phillippine prison camp in World War II.

A writer who specialises in solving mysteries uncovers the body in a seven year old case, but it raises more questions than it answers...

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

An electronics genius is busted out of prison so he can mastermind a massive robbery of diamonds from the Honolulu Diamond Exchange.

Five-O is up against a sophisticated gang who have come to Hawaii to cash $750,000 of traveller's cheques.

A policeman who was kicked off the force blames McGarrett and Five-O and plans to kill the Governor.

A veteran criminal who has already had dealings with Five-O escapes, and plans to steal millions of dollars from drug smugglers.

Singer Eadie Jordan has not only a comeback concert to perform, but also a serious heroin addiction. Poisoned heroin is being peddled on the islands, and McGarrett must try to save Eadie from scoring for the last time.

When a letter bomb kills a Naval Officer whilst McGarrett is on Navy Duty, he is called upon to investigate and uncovers a plot involving an old nemesis...

Five-O must act swiftly when the daughter of a top neurosurgeon is kidnapped by Wo Fat in order to make the surgeon operate on a wounded U.S. undercover agent who is carrying secret inforrmation of use to the Chinese.

Five-O must deal with treason, murder and double-crosses in order to solve the case and prevent the U.S. from being flooded by fake currency.

When a young woman is beaten and raped and a soldier is arrested for the crime, McGarrett begins to have doubts about his guilt.

Five-O has a suspect for a murder, but they have one problem. How can the suspect have been in two places at the same time?

Eddie Josephs is a paranoid schizophrenic who is carrying out murders based on old Five-O cases. McGarrett must follow his clues and catch him before more people die.

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

Chin Ho and Dan Williams are tracking a safecracker but he pulls a gun and Danno ends up shooting him. McGarrett takes his identity of Harry Brown and must infiltrate a sophisticated gang of international thieves.

Five-O's efforts to rescue a young boy from kidnappers go wrong when Kono is captured and beaten. An angry McGarrett must work out a way to rescue Kono without further endangering him.

Wo Fat and other top international agents converge on Hawaii to place bids on printing plates for twenty dollar bills, which are in the possession of a former friend of McGarrett.

Danno's past comes back to haunt him when the brother of a young boy he shot is released and wants revenge. The brother takes Chin Ho, Jenny and others hostage in McGarrett's office and threatens to blow them up, and Danno must resolve the tense situation.

McGarrett is framed in an elaborate set up by Wo Fat, and has to contend with a foreign double amongst other problems.

McGarrett sets up a cordon of police around a young woman to capture her boyfriend who has escaped from jail, but all is not as it seems…

A young widow becomes part of a blackmail plot involving the murder of a Chicago mobster.

An investigation into a murder is sent off track through the modification of computer information, and Five-O must use the latest technology to rescue the case.