An army sergeant and a office worker have a scam in which they use bar girls to claim G.I. widow benefits, and then murder them to take the cash. McGarrett and company must use the girls to get to the core of the plot.

A Japanese World War II veteran, Yoshio Nagata, escapes from a mental hospital and tries to carry out his wartime orders to blow up a refinery.

A tsunami warning is called and a geneticist is evacuated from a conference. He is then kidnapped under the orders of Wo Fat, but he uses his diabetic medical condition as a ploy to stop Wo Fat from carrying out the plan to return him to China.

A middle-aged mainland hardware salesman uses a prostitute, and then witnesses her murder by a mobster. He refuses to testify because of the damage to his reputation and that he doesn't want to be involved. McGarrett must persuade him to do the right thing.

McGarrett must interrupt his Sunday to deal with both terrorists and politics when a revolutionary group steal guns from a barracks for their overseas cause.

A university professor, Dr. Paul Farrar, is using hypnosis to programme students into becoming assassins. McGarrett uses a policewoman as bait for Dr. Farrar, but the plan goes wrong and her life is put in danger.

McGarrett must counter a threat by international terrorist Erich Stoss to use a fungus to wipe out Hawaii's sugar cane, half of the world's supply.

Four university students hatch a plot to steal the robes of King Kamehameha, and McGarrett and the team must apply pressure to the gang's weak point to retrieve the robes and catch the thieves.

McGarrett gets a phone call from Singapore and goes to rescue Nicole Wylie, a witness who has changed her mind and wants to testify. However, the pair must face many dangers on their return trip back to Hawaii.

An assassination attempt on a prominent politician, Charles Irwin, leads Five-O to Mike Finney, a former racketeer who has been clean for nine years. However, Finney insists he is innocent, and the trail of clues leads right back to Irwin.

When a dictator's plane is diverted to Hawaii as part of a plan to kill him, McGarrett must deal with the complex politics of the situation and protect the hated leader.

When a young son of a businessman escapes from captivity by ‘The Devil' and ‘Mr. Frog', Five-O must recover the $300,000 ransom money that the desperate father paid.

Two young men play an increasingly dangerous and deadly game for the attentions of a beautiful but spoiled heiress, who plays them off against each other.

A career criminal, Connors, fools McGarrett and the team into protecting the wrong bank, and robs a nearby one, taking the wife of the manager hostage. Things turn ugly when one of his goons assaults and murders her. McGarrett must race to capture Connors before he can do any more damage.

McGarrett gets a surprise birthday party, but when he goes to pack the presents in his car, it explodes and blinds him. Danno, Chin Ho and Kono must work to catch those responsible, whilst McGarrett has to get used to not having his eyesight.

Don Miles, a health freak, uses a hanging-type exercise to promote his wellbeing, but his girlfriend Wanda tries it, and seemingly dies in the attempt. However, all is not what it seems…

Two military policeman spot John Mala, a man who McGarrett has helped in the past, but who has gone AWOL. One of the policemen is shot, and tensions rise as Five-O and the army police clash in their techniques of investigation and their treatment of the local population.

A psychiatric worker, George Loomis, is trying to drive a fellow Vietnam veteran Ted Frazer crazy in order to cover up the fact that he massacred his own platoon during an action. Loomis kidnaps boys and drugs Frazer to make it look like Frazer is mad and to blame for the tragedy. McGarrett and the team must unravel this web of lies and clear Frazer.

Peter Corman is murdered during a game of poker, and his brother Lorenzo arrives in Hawaii for revenge. McGarrett must work out what happened and prevent Lorenzo from carrying out his intentions.

Chin Ho is accused of bribery, and cannot provide alibis for the nights in question. Worse, he is called to the middle of nowhere for a set-up. Chin's position is threatened, and the Governor orders an inquiry. McGarrett and the others must work out how Chin was framed and clear him of the accusations.

Lew Morgan and his wife are friends of Danno, but she is murdered, and Morgan sets out to find the culprit. However, his wife seems to be hiding secrets that may have caused her death.

A research scientist, Dr. Royce, is set up by revolutionaries to be transported away from the islands in a submarine. McGarrett must stop this from happening and also has to contend with the interference of federal agents in the case.

Dr. Alexander Kline, a biological scientist, views his work as evil, and to prove it, he plans to unleash a deadly germ that would kill thousands. Three dead cows lead McGarrett on a desperate chase to track down the toxin, involving a friendly telephone operator and top Washington agents.

Dr. Kline's deadly toxin is lost, he is having second thoughts about his plan, and McGarrett has to find the vial before it disintegrates and poisons the whole island. Already the toxin is doing its deadly work as innocent people come into contact with it.

Camilla Carver, a con-artist, blackmails a politician to take her to an event where she can steal the priceless Queen of Polynesia emerald and swap it for a fake. However, McGarrett and the team are at the event and make sure that neither the gem, Carver or her accomplice vanish.

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.

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.

Dr. Lemira, an opposition leader for Greece, is living in exile in Hawaii, but Klaus Marberg is sent to assassinate him. His plan is to get himself shot and work his way into Dr. Lemira's confidence so he can kill him easily. McGarrett must work out this plot and save the day before it is too late.

When a lawyer is murdered, his wife becomes the top suspect and McGarrett investigates. However, matters are complicated by the fact that the woman had a relationship with McGarrett, and he jeopardises his job because of this.

Shortly after giving a recital, the violin of a visiting Russian virtuoso is stolen, and McGarrett must retrieve it before the theft turns into an international incident.

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.

When a ruthless businessman is blown up in a boat explosion, Five-O has many suspects to choose from, and they use psychological methods to determine the guilty party.

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

The hitman sent to kill the witness to a two year old murder instead falls in love with her and McGarrett and the team must lead the search to find her before duty overtakes love.

Five-O search for the criminals who have set up Hawaiian singer and ecologist Jimmy Nuanu as the fall guy for a sewage plant bombing.

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

Dan Williams's fiancee is murdered by a strangler who writes poetry in lipstick on his victims' legs. Danno resolves to catch the culprit who has other murderous plans to carry out.

McGarrett must apprehend two abductors who are on the run with the proceeds of their crime in order to protect the lives of their co-conspirators.

When a convicted murderer, Harry Kellem, hears a dying man say he committed the crime that Kellem was jailed for, he takes a doctor hostage and McGarrett must negotiate his way out of the situation.

A cowboy fears the loss of his land to a crooked estate agent and accidentally kills him by hitting him. McGarrett and his team must track the cowboy into the mountains and persuade him to give himself up.

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

Five-O investigates the death of Vietnam hero Jack Rigney, who fell from a balcony. His father is a World War II veteran, but his brother Michael is a peacenik, and Danno goes undercover as a draft dodger to help solve the mystery of Jack's death.

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.

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.

The wife of an arms dealer is kidnapped by revolutionaries who want the guns diverted from their original destination, but the arms dealer himself is not as innocent as matters would indicate…

The wife of a convicted man fakes evidence in a new crime so that McGarrett will have to re-open her husband's case.

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.

A baseball player, Lon Phillips, brings his backward son to Hawaii to escape threats on his life on the mainland.

The son of the baseball player becomes the vital witness in a murder, but he is reluctant to tell either his father or Five-O of the crime.

A ten year old case is reopened when an archaeological dig unearths the skeletons of two murder victims.

Gangster Johnny Oporta arranges for his enemies to be murdered and then covers up his crimes by incinerating their bodies. McGarrett and the others must stop this murderous spree.

Vic Tanaka is murdering women and painting their faces to resemble a prostitute he once knew, who is now happily married. McGarrett and his team must find the killer before he does any more damage.

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

A hippie robs an embezzler of the key to a locker containing $250,000. Meanwhile, Danno is trying to contact the daughter of his Berkeley University landlady, who happens to be the hippie's girlfriend…

Young Vietnam veteran and marksman Billy Shem Jr. buys a rifle under false pretences and proceeds to a bunker at Diamond Head. He then takes pot shots at the people on the road and then the police who arrive. McGarrett must neutralise the threat he poses by any means possible.

While investigating the death of a security agent at an airport, McGarrett comes into contact with a gang who hijack cargo.

Five seemingly good citizens with different motives band together to steal $6,000,000 while McGarrett is away on Maui at a trial.

McGarrett finds holes in a convict's story and a husband becomes a suspect in the murder of his wife.

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

McGarrett must deal with the conflicts between four gangs of differing ethnic background, and try to uncover illegal activities.

A mob boss seeks revenge on a former boxer who smashed the hand of a novice to prevent him from ending up ruining his life in the boxing ring.

McGarrett and the team must find out who is behind a series of ecological stunts, when it is feared that a company executive will be their next target.

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

A woman attempts suicide in order to get her boyfriend to come out into the open and expose himself to an assassination attempt.

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

Several faces from the past reappear as McGarrett must stop Wo Fat from carrying out his plan, a ninety second attack on a missile tracking base.

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

An eccentric billionaire is accused of murdering a business associate, but will not leave his boat to defend himself against the accusations, allowing his associates to declare him mentally incompetent.

Three real estate crooks die horrible and mysterious shellfish related deaths, and McGarrett and the others must establish the link between them, and who has reason to want them dead.

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.

Danno goes undercover onboard a Navy ship to try and uncover how sailors are smuggling heroin onto the islands.

A psychotic man named Ralston is killing the wives of members of his army unit, and Five-O, including Kono on his last case, must stop him before he commits any more crazed attacks.

A local thug, Piro Manoa, is trying to create the impression of corruption in the Five-O force, and Duke is implicated in a murder. McGarrett and the team, with new recruit Ben Kokua, must save Duke's position and work out the plot of the organisation behind the false accusations.

When two of a egotistical racing driver's support staff are murdered, suspicions of sabotage fall upon his attractive girlfriend.

A private investigator, Sam Tolliver, arrives from Texas to help an old friend who is being blackmailed and is at risk of being killed if he doesn't pay up, but he ends up wanting to become part of the blackmail operation.

Danno shoots an apparently armed teenager but finds that he was mistaken, and public opinion and the teen's brother turn against him. McGarrett must act to defuse the potentially explosive situation.

Wo Fat is suspected of being behind the theft of a mobile ICBM device, and McGarrett with other top officials must stop him selling it off to the highest bidder.

Army computer technician Jack Gulley kidnaps a scientist and then uses a planned heist by three accomplices on a military base to divert Five-O's attention from his sale of the scientist to the highest bidder.

A doctor tracking venereal disease is murdered, and Five-O must track the series of encounters to find out who is a carrier. Their investigation is made doubly important by the murder of a young woman who is close to a upcoming politician. He seems a likely suspect but McGarrett suspects a deeper plot.

Danno is found in the back of a truck, dazed and confused, and McGarrett and the others must help him piece together how he came to be in that situation.

McGarrett becomes involved with the Vashon mafioso family after the youngest member, Chris, is implicated in a daring raid on a hotel.

McGarrett must contend with Honore Vashon, who wants revenge for his son's death.

Dominick Vashon, the patriarch of the clan, makes his attempt to bring down McGarrett and Five-O.

When McGarrett arrests a group of vigilante nationalists, hidden bombs at the courthouse threaten to destabilise the islands.

A husband and wife team of scam merchants get caught between some of Hawaii's most powerful mobs.

Two drifters, Gar and Nina, steal children and sell them on to a mainland adoption agency in order to raise the cash to buy a boat and go cruising.

McGarrett agrees to let Toni, a tough female convict, get married and have a honeymoon in protective custody as long as she will testify against a local hood.

A crazed electronics wizard threatens the lives of a psychiatrist and his patients by using electronic devices and gadgets.

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?

A senior partner in a stock exchange firm comes up with a foolproof plan to rob the Honolulu Stock Exchange.

McGarrett and company must break through a tissue of lies in order to protect a Russian defector from being killed.

Two simple criminals kidnap a young girl, and hide out in a bunker at Diamond Head. McGarrett must unravel the reason why they are there and get the girl safely away from them.

A travel agent who operates gambling trips is killed in order to send a warning to others that the syndicates will not tolerate competition.

Chin Ho must face the fact that his daughter, Alia, is in love with the son of a local criminal under investigation, and that she plans to get married to him.

A burglary at the home of a well known island family sets off a series of events that ends in murder.

A single person is holding out in a Five-O trial, and McGarrett and the team have to find out who is stalling and why they are doing it.

A amputee with no hands sets out to kill every police officer who contributed to his injury, and that includes Steve McGarrett.

Murders are being committed seemingly at random every six weeks, and McGarrett is at a loss to understand the motives for these crimes. However, a newspaper may hold the answer.

When a large amount of diseased rats are found on a boat with all the crew dead, Five-O must contend with an outbreak of bubonic plague.

A family of white-trash mass killers arrive on Hawaii after wreaking a trail of devastation on the mainland, and McGarrett must catch them before they can do more damage on the islands.

Buildings are being set on fire on Sundays, and a known firebug is the top suspect. However, McGarrett begins to think that others may be responsible.

A corrupt federal agent who is tracking a man under indictment for tax evasion kills him for the $600,000 he is carrying, and then loses the money.

The killing of an important pimp threatens an all out war between two competing vice empires.

A string of five murders of wealthy men leads McGarrett to a crooked inheritance scheme.

A glamorous woman sets up an opal smuggler so her accomplices can rob both the smuggler and a jewellery store at the same time.

A dictator must evade a female assassin sent to kill him, one that looks just like his own daughter.

McGarrett brings in a document expert to help him crack a case involving forged government securities, but he soon becomes suspicious of the expert as well…

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

Harry Foxton, a gambler, is himself the subject of huge bets over what hour he will die. McGarrett must work out the gambler's complex relationships to get to the bottom of this case.

A thief known for using sleight-of-hand is hired to steal a valuable nickel, but the coin ends up on a journey across many miles and through many hands.

A mock military emergency leaves a bank open for a robbery, and Five-O must travel to the opposite side of Oahu to find out more in their investigation.

An exciting surf beach is the location for a filming session, where a man catches a killer on camera.

A pair of crooks team up with local criminals and use phony diamonds as bait to prey on wealthy male tourists. McGarrett and Five-O must shut off this sinister racket.

A young man witnesses a murder, and finds himself and his family are now the killer's targets.

The son of a Federal Narcotics officer becomes involved in a heroin refining operation.

When a man is found dead with gold dust on him, McGarrett and his team must investigate where the stolen gold came from and how it is being bought onto the market.

A series of rapes and murders occur, and the main suspect seems to be a police officer...

A right-wing crackpot, Cord McKenzie, metes out ‘justice' to people who have been found innocent on technicalities or released early. He thinks he is helping the police, but McGarrett thinks otherwise.

While investigating a robbery and kidnapping, the trail of clues leads McGarrett and the team to an ocean liner with a deadly passenger.

An aging jewel thief steals from rooms at Waikiki hotels, and taunts Five-O by leaving a trail of clues behind.

Danno and a college professor are kidnapped by a revolutionary group of young radicals led by a hardened criminal.

A geophysics expert, Bernard Brown, is heavily in debt, so he comes up with a plan to cause an explosion in the Hawaii Volcanoes National Park, which will cause lava to pour all down the hillside and into the city of Hilo, unless the Governor comes up with half a million dollars as a ransom.

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.

A sophisticated thief is selling his goods to legitimate businessmen, and Five-O must find a way of trapping him.

Senator Harlan Henderson suffers from multiple personalities, and one side of him wants to kill himself. However, he ends up blowing up his secretary, and McGarrett uses handwriting and a diagnosis from a psychiatrist to try to crack the case.

A criminal, Hobart, is robbing liquor stores using a policeman's former gun, but the officer wants it back as he used it to kill a bankrobber five years before and the body has been uncovered.

When his son is beaten to death, a powerful cattle baron takes matters into his own hands, and McGarrett and Five-O must prevent the rule of law from breaking down.

A gangland execution investigation takes a turn for the peculiar when it is found that the victim had two identities.

Five-O must investigate why three infallible security systems are failing to prevent the theft of priceless artworks.

After an attempt is made on Steve McGarrett's life, he is drawn towards a female art dealer, but she too may not be good for his health…

Two conmen use a gang of Five-O lookalikes and doubles to extort money from Honolulu businessmen.

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

McGarrett and Five-O need to find out why a Japanese banker ritually killed himself and catch a true criminal into the bargain.

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

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.

Three women desperately in need of money take to armed robbery of tourist buses as a way to raise some quick cash.

When a young boy is arrested as a witness to a murder, McGarrett must contend with a fiery deputy public prosecutor.

A million dollar reward for the return of five figurines sparks off a trail of murder and theft that leads to Hawaii.

When a psychotic man kills his doctor, Five-O must use a unfinished painting to gather clues to his whereabouts.

An elaborate sea and air scheme for heroin smuggling goes unnoticed until one of the gang tries to sell out their plan for a fix of heroin.

McGarrett must prevent a mob war by tracking down an unknown hitman and his intended target.

When a deranged ex-Army officer shoots a policeman and takes a young girl hostage, McGarrett disagrees with a police captain over the best way to free her.

A Saturday Night Special passes from person to person and causes Five-O trouble and others misery.

Five-O works with a air traffic investigator in order to put a stop to illegal ticket sales which have already cost several lives.

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...

McGarrett must try his utmost to foil Wo Fat's plans which include hostages and brainwashing.

McGarrett must again face mobster Charlie Bombay when a plane carrying them to Honolulu crashes in the forests.

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

Five-O must find a female courier who witnessed a murder before a hitman can...

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

McGarrett offers himself as a hostage exchange, but is then put on 'trial' by Honore Vashon.

McGarrett meets his match in Dr. Grant Ormsbee, a grumpy and aggravating scientist who is sheltering a suspected Chinese defector.

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...

Danno's Aunt Clara becomes acquainted with a man on the plane to Honolulu, but becomes concerned about him afterwards. Dan, Steve and the others ignore her at first, but then the man turns up dead...

A vice-principal enlists the help of his students and a submarine to smuggle drugs.

When Five-O fail to prevent a series of thefts at dockside warehouses, an influential owner creates trouble for McGarrett.

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

Three boys commit a gang rape on a waitress, but one is the son of a Senator and the crime is covered up...

Whilst trying to stop the smuggling of small Oriental animal statues, McGarrett is caught illegally in possession of one of them as part of his personal collection.

A disturbed young man steals nerve gas to use against a visiting royal family as revenge for the death of his father.

When an elderly importer who was a World War II Japanese spy is killed, Five-O seeks his killer.

A clear cut murder case against an island mobster is derailed due to McGarrett.

A crooked contractor and a buildings inspector are under suspicion after the new Global Trade Center in Honolulu goes up in flames.

When an airline stewardess and a hang-gliding instructor are murdered, Five-O must find the killers.

Criminals threaten to use a special type of moth to wipe out the sugar cane on Hawaii and destroy the industry.

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

Ben Tanaka, a well-known ecologist, seems to be behind the kidnapping of a wealthy land developer's wife, but all is not as it seems and a conspiracy gradually reveals itself.

McGarrett sends an undercover agent into a rehabilitation home for juvenile offenders to find out who is behind the theft of gold from dental supply warehouses.

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.

McGarrett must solve a daring bank robbery committed during the King Kamehameha Day Parade under the cover of a historic re-enactment.

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!

An Irish terrorist uses disguise and deception in order to be able to smuggle explosives for the Troubles.