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.

The series concludes with the final showdown between McGarrett and Wo Fat. Three scientists have gone missing. They have one thing in common: they all attended a symposium that discussed a possible space-based, laser defense system. McGarrett impersonates a fourth scientist, Dr. Elton Raintree, who attended the same gathering and is soon abducted. Wo Fat is behind it all and wants the scientists to complete their work and produce such a device.

McGarrett and Kimo must stop a gang of trained assassins from disrupting a meeting of energy ministers.

Labouring under a ban on cooperation by native Hawaiians because of a Kahuna, McGarrett must try to prevent war on the streets...

When a preacher is attacked by a man convinced that he is responsible for his wife's death, Five-O investigate more closely and discover some less than godly motives.

Danno is surprised when he bumps into a former flame and even more concerned when she seems to be involved in criminal activities.

Five-O must deal with the plans of a Neo Nazi organisation to kill Bobby Tamara, the ""Hawaiian Kennedy"".

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

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

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

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.

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.

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.

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.

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

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

McGarrett is suspicious of an aide who arrives in Hawaii to retrieve millions of dollars held in trust for a Southern Asian state and he must prevent a daring gold robbery.

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.

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

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 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.

A aging crook decides to use dollar bill printing plates he made to raise cash for a charity, but he fails to realise the trouble that this will cause.

A young man on vacation has strange visions that lead him to the site of an old murder and help him discover a lost family.

A group of terrorists capture a female officer and use her to further their aims, and McGarrett and the team must find a way to take them out without endangering the life of Officer Dean.

Millicent Shand returns and claims that her niece's husband has faked his own death in order to get his hands on $500,000.

When a robbed bank vault shows no signs of break-in, an inside job seems the likely solution. McGarrett's trail of clues leads him back to the builder of the vault and his wife...

The rival gangs are on the brink of all out war, and Five-O must struggle to stop them.

The death of a prominent politician reveals a strange love triangle.

McGarrett is the lone hold-out in a trial where the guilt of the accused seems certain.

An assassin who doesn't know he's an assassin? Sounds like a punch line from "The Naked Gun," but it's the story of this episode, where a diplomatic courier with a briefcase chained to his wrist is hypnotized and programmed to rig the case with a bomb. When Danno goes undercover to ferret out the assassination ring, he himself is brainwashed and programmed to kill McGarrett.

When an astrologer visits McGarrett to inform him of a murderer with a terrible temper, his antagonism lessens when her assumptions seem to be partly true.

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

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

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

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

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

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 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.

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

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.

The murder of a Nazi-hunter and discovery of a World War II medal set McGarrett and the team on the trail of a Nazi war criminal living in Honolulu...

A gang of clever students use radio-controlled planes to execute the theft of Queen Liliokalani's jewels.

Five-O must close the heroin smuggling operation to exonerate the Governor and catch the figures behind the scheme.

When a woman dies due to heroin packets bursting inside her and the Governor is implicated, McGarrett and Danno head off to Singapore to discover a smuggling operation.

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

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

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.

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

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

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.

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 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.

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.

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

When the boxing son of a policeman, Phil Kalama, is killed, he starts a personal vendetta, and McGarrett must both solve the crime and stop Kalama from committing another murder.

When a woman is stalked by a strange figure, she seems to be seeing things and her friends are worried as to her mental health. However, events prove her case and an accomplice is revealed...

Tony Alika and Guido Marioni, killer of Kimo's family, together hatch a plot to frame and embarrass the Five-O team by making them look stupid or corrupt.

Jessica Humboldt, an astrologer and friend of Agnes DuBois, comes to McGarrett with news that a forthcoming match will be disastrous for a boxer. McGarrett must overcome his suspicions and crack the case.

A group of high society men set out to see that justice is done - the catch being that it is justice on their terms only...

The hunt for a high-rise killer is made more difficult for Five-O when a journalist offers to share his profits in exchange for the killer's story.

When the son of one of Steve's friends dies of an overdose, he goes after a doctor that he suspects of over-prescribing drugs.

A private detective is rescuing girls from prostitution, and using the opportunity to kill the pimps as well.

McGarrett assists a convict in his escape, so that he can go back to his gang and provide Five-O with inside information.

When a street robber claims that he stole King Tutankhamun's mask for fun, McGarrett suspects there is more to the case than simple robbery.

After a government agent is murdered, McGarrett must identify the traitor in a scientific facility.

A cryogenics institute comes under suspicion when an investigative writer becomes involved.

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

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

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

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

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

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

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

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

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.

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.

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

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.

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.

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

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

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

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.

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.

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.

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.

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.

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

A politician trying for the Senate is weakened by the murder of the man who is blackmailing him.

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.

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

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

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

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

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

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…

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

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

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.

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.

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.

Steve is framed on the orders of a gambling syndicate, and becomes involved with a woman who is part of the case.

A vacationing heiress seems unconcerned when McGarrett warns her that someone is after her ruby.

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…

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.

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

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

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…

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.

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

In order to find out the identity of the murderer of a union leader, McGarrett goes undercover as a longshoreman.

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

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.

Five-O probes into the death of an official who was instrumental in the development of the islands, and discovers a tangled web of lies and deception.

Danny Williams is accused of shooting an apparently unarmed young boy. Meanwhile, in his investigation, McGarrett comes up against Big Chicken, a nasty dope dealer.

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.

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

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

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

The return of a disgraced alcoholic policeman causes extra problems in the pursuit of a pair of armoured truck robbers.

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

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

A secret submarine, the murder of a Navy officer and strange amnesia create a puzzling case for Steve McGarrett.

A woman buys fish from a monger, and is followed home and murdered. McGarrett and the team must discover who killed her and stop smugglers from completing their operation.

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.

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

Sam Kalakua, a distant cousin of Kono, is being frightened into an early grave by an fake apparition of a Hawaiian god created by his nephew, who wants to sell the estate to a land merchant.

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

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.

A young singer, Bobby George, plans his own kidnapping as a stunt, but when his father offers $500,000 for his release, his co-conspirators decide to double-cross him and take the money.

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.

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

A gang of university students plan a hoax tidal wave in order to steal priceless jewelry.

McGarrett becomes involved in a love triangle between a young local man, a rich girl and her father who hates the Hawaiian origins of the boy.

When a young female student is found murdered on campus, suspicions fall on her boyfriend but McGarrett senses that something is not right.

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

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.

While pursuing a drug dealer, McGarrett also has to contend with a federal agent.

When a leader of a student peace movement is killed, McGarrett has to investigate the murder against a wall of silence and a distrust of the police by the activists.

When a singer, Joey Rand, finds that his career doesn't pay well enough, he turns to cat burglary. However he doesn't reckon on Hawaii Five-O.

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.

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

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

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.

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

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.

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.

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.

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

After a girl dies during a high speed chase, a trail of clues leads McGarrett to a Los Angeles prison, where he must act the part of convict Steve Crowley to gain the trust of his cellmate for a break-out, which will help reveal the plans of the crime.

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.

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.

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.

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

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

Young Eadie Hastings cannot be saved by Danno from jumping of a cliff, and Five-O think that she was high on speed. They track her source to a crank teacher, Professor David Stone, and Danno must pose as a surfer to investigate the drug pushers and users.

A man is found dead after having been robbed by a motorcyclist with a gun, and McGarrett is shocked to discover that the man was suffering from bubonic plague. The islands are quarantined, and the team must follow a series of clues to discover the cause of the outbreak.

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

Victor Reese and his wife Nora are conning rich widows out of their savings, and then poisoning them and dumping them in the ocean. McGarrett and company hatch a plan to use a female officer to trap the duo.

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.

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.