McGarrett poses as a scientist and allows himself to be kidnapped, setting up a final confrontation with his evil nemesis, Wo Fat.
McGarrett probes the murder of a blackmailer whose information could destroy a political candidate's campaign.
McGarrett has difficulty understanding the motivation of a killer preying on seemingly harmless birdwatchers; guest John Dehner.
A famous Nazi hunter is murdered, and McGarrett becomes convinced the trail to the dead man's quarry will also lead to the killer.
Blame falls on Five-0 after three students accomplish an apparently impossible jewel theft; guests Jeff Daniels, Linwood Boomer.
An intuition warns McGarrett of danger when he meets the clever aide of an Asian leader in Honolulu to pick up a shipment of gold.
A bit of luck clues McGarrett to the work of a counterfeiter who has reluctantly come out of retirement; guest Neva Patterson.
Foreign agents use every means, including assassination, to stop a vital energy conference; guests Gary Lockwood, Monte Markham.
A hairdresser provides an important clue in the kidnapping of a socialite whose frightened husband doesn't want police involved.
McGarrett investigates after the residents of a privately owned island exhume the remains of two young people and dump them at sea.
The key to a stolen jewel cache and a long-missing accomplice may lie with a psychic who was only a child when the crime occurred.
McGarrett confronts two terrorists who threaten to kill their hostage, a woman police officer, unless their demands are fulfilled.
The Five-0 team follows the trail of a stolen World War II souvenir handgun whose various users have caused a string of murders.
A confused woman (Linda Marsh) claims a man (Soon-Teck Oh) she once shot to death is behind attempts on her life; guest Guy Boyd.
Someone is causing the Five-0 members to appear inept and foolish in public; guests John F. Ryan, Jason Evers.
Although skeptical, McGarrett heeds an astrologer's (Jayne Meadows) warning about the grim portents she sees in a boxer's chart.
McGarrett thwarts a secret ring of high-society vigilantes; guests Robert Reed, Elyssa Davalos.
After a Five-0 recruit is killed by bandits, McGarrett tries to prevent the officer's widow from seeking revenge.
McGarrett is in the middle when a group of native islanders takes on Hawaii's crime syndicate; guest Barbara Luna.
Native islanders battle a crime syndicate for possession of a labor union and tourism profits; guests William Smith, Harry Guardino, Paul Smith, Barbara Luna.
McGarrett and Danny investigate a drug ring in Singapore; guests Barry Bostwick, Victoria Principal, George Lazenby.
An Asian dies en route from Bangkok to Honolulu when a bag of heroin bursts in her stomach; an investigation links the drug ring to the Hawaiian government; guests Barry Bostwick, Victoria Principal, George Lazenby.
McGarrett's hunt for a serial murderer is made more difficult by the interference of a writer looking to cash in on the killer's story.
McGarrett must protect a physician suspected of drug peddling from a grieving father (Cameron Mitchell).
McGarrett suspects an old police friend (Robert Loggia), a private detective, is involved in murders of pimps.
A songwriter (Paul Williams) with a photo blackmails a racketeer and a local power broker.
McGarrett warns a flippant socialite (Tricia O'Neil) about bringing her ruby along on a Hawaiian trip; guest John Saxon.
An elderly detective-novelist (Mildred Natwick) informs McGarrett she solved the death of a scuba diver; guest Robert Vaughn.
After a major theft at a seemingly impregnable bank, McGarrett finds a connection to similar, earlier crimes; guest Robert Reed.
A singer's manager (James Darren) seeks a mob alliance to keep a local hood away from his client (Yvonne Elliman).
A mobster's plans to acquire a nightclub include murdering its singer (Yvonne Elliman); guest James Darren.
McGarrett is suspicious when the gun used to threaten an evangelist is found to be unloaded; guests Jean Marsh, James B. Sikking.
The hit-and-run death of a Canadian businessman registered under an assumed name puzzles McGarrett; guest Sharon Farrell.
Danny's high-school sweetheart (Katherine Cannon) is arrested for shoplifting then linked to a mad killer; guest Burr DeBenning.
Investigating a Chinese crime syndicate in Honolulu, McGarrett arranges the escape of a mob-connected prisoner.
McGarrett's suspect in a theft at an Egyptian exhibition is only a small-timer who winds up murdered.
Danny goes under cover in a neo-Nazi organization to investigate a violent hate campaign directed against a congressional hopeful.
Hired by a crime-syndicate chieftain, a jet-setter and his girlfriend (Zohra Lampert) scheme to discredit McGarrett.
Sole dissenting juror McGarrett insists on a re-enactment of a murder to confirm or erase his doubts about the accused's guilt.
Narrowly escaping death from a bomb-rigged briefcase, McGarrett is again in danger, from drugged and brainwashed Danny.
A famous astrologer (Samantha Eggar) promises she can predict the next serial murder linked by a common horoscope.
McGarrett calls on a Pentagon agent (Steve Kanaly) after an operative is slain probing a research organization.
A sudden loss shakes the Five-0 team during an investigation of a Chinatown crime operation; guest Reni Santoni.
The body of a horse-breeder, supposedly buried four months before, is found in a cane field.
The threat of a diplomatic incident looms when a reporter (Luciana Paluzzi) refuses to reveal her source for a planned kidnapping.
Strange occurrences in a cryogenics institute interest a mystery writer; guests Peter Lawford, Mildred Natwick.
An artist's death spurs a series of puzzling homicides that seem linked to the dead man's estate; guest Helen Funai.
A collector of World War II memorabilia bombs firms owned by a respected Japanese-American businessman.
McGarrett reluctantly sends a Maui policewoman (Carol Lynley) under cover to infiltrate a narcotics operation; guest Vic Tayback.
The death of a girl links two terrified surfers -- one who caused the tragedy and another suspected and on the run.
McGarrett clashes with a federal agent while looking for a drug dealer sought for killing a police officer; guest Charles Cioffi.
A rising young politician (David Birney) is the victim of a blackmail scheme designed to squelch a congressional probe.
McGarrett takes his first under cover assignment when he poses as a merchant seaman to probe the murder of a labor-union reformer.
A murder investigation leads Five-0 to the proud matriarch (Eleanor Parker) of an influential island family; guest Cal Bellini.
McGarrett gets involved when an influential father objects to his 16-year-old daughter's romance with a poor boy.
The missing student (Sian Barbara Allen) of a foreign expatriate may hold the vital clue to solving her instructor's watery murder.
Brilliant collegians perpetrate a tidal-wave hoax as part of a jewelry heist; guests Leigh McCloskey, Sid Clute.
McGarrett suspects a link between the appearance of a mystery sub and the murder of a U.S. Navy officer; guest Geoffrey Lewis.
An Eastern European tennis star, secretly in love with an American player (Tim Matheson), defects in Hawaii; guest Kurt Russell.
A real-estate huckster, a former astronaut, helps solve the murder of an investigative reporter.
A disgraced former police officer complicates McGarrett's search for two fugitives who robbed an armored-truck; guest Gil Gerard.
An ancient taboo seems to be the motivation for the murder of an archaeologist rumored to have found the tomb of King Kamehameha.
A Honolulu police department officer (John Rubenstein) is a guest in a home when a raid there uncovers a bookmaking operation.
The governor orders McGarrett to cooperate with a magazine writer (Jean Simmons) who criticizes his handling of a kidnap case.
A shipping tycoon (Rossano Brazzi) calls on the Coast Guard and Five-0 after one of his freighters is hijacked; guest Mark Lenard.
An Irish terrorist infiltrates a U.S. military facility to hijack explosives for sale in Northern Ireland; guest Stephen Boyd.
A team of criminals schemes to steal M-16 rifles and sell them to international terrorists; guests Lee Purcell, Charles Frank.
A Los Angeles police detective's runaway daughter is framed for murder and hides in a religious cult; guest Jessica Walter.
The hunt for a missing rodeo cowboy links with the discovery of the bodies of a woman and an orange-painted man dumped in the sea.
McGarrett begins to become suspicious while helping the Navy search for a sunken Soviet submarine; guests Pat Hingle, Mel Ferrer.
A mainland gangster needing a place to launder money tries to force a football-club owner to sell his team; guest Jo Anne Worley.
A country singer is kidnapped, then apparently dies at sea with her abductors; guests Pamela Franklin, Christopher Connelly.
An elderly man (Barnard Hughes) wires himself to a bomb and takes hostages to halt his home's demolition.
The head of a gambling syndicate kills a police officer in a hit-and-run auto incident; guests John Ritter, Nehemiah Persoff.
McGarrett fears a rapist-murderer roaming Oahu will find a girl lost in the mountains before Five-0 can rescue her.
McGarrett and a Tokyo police officer hunt smugglers sending handguns to Japan; guests France Nuyen, Edward James Olmos.
Bullets that killed McGarrett's girlfriend came from the chief's service revolver; guest Camilla Sparv.
An avenging man (Rich Little) pursues a drug dealer who contributed to a former addict's death; guest Mel Ferrer.
A vengeful ex-convict (Don Stroud), partially paralyzed by a police bullet, begins shooting officers; guest Gerald McRaney.
A crime czar's aide learns his boss's daughter took $10 million from her father and decides to blackmail her; guest Clyde Kusatsu.
A mobster who staged his own 'death' to elude a conviction comes back to reclaim his former crime syndicate; guest Meg Foster.
A man who was wrongfully convicted of murdering his wealthy wife escapes from prison to prove his innocence.
Participants in a yachting race from California to Hawaii become the targets of a trio of mutineer-murderers.
A forger (Kevin McCarthy) steals over $14,000 from the Five-0 team, then targets a bank and the U.S. Navy.
McGarrett searches for an international assassin whose name, description and next victim are unknown.
Five men found in the crater of the Mauna Loa volcano died of exposure to plutonium; guests Pat Hingle, Alan Fudge.
McGarrett is sure that an extortionist is responsible for the serial murders of prostitutes; guests Ned Beatty, Elaine Joyce.
A museum curator (Clu Gulager) plots Hawaii's most daring bank heist.
In Hong Kong on Wo Fat's trail, McGarrett has amnesia from nearly drowning; guest Dina Merrill.
The probe of a theft of nerve gas puts McGarrett on Wo Fat's trail, which leads to Hong Kong; guest Dina Merrill.
McGarrett sends in an undercover agent to identify the gang responsible for a series of dental supply gold thefts.
McGarrett doubts the evidence of an ecologist filmed in the act of kidnapping.
Terrorists lock an industrialist's son in a capsule with a limited air supply; guests Bruce Boxleitner, Liam Sullivan.
Criminals threaten Hawaii's sugar-cane industry by introducing the larvae of a voracious moth; guest Richard Kiley.
A murder victim's roommate puts herself in danger to help catch the killer; guest Lee Purcell.
Five-0 pursues a crooked building inspector after a deadly fire devastates a new trade center; guest John Karlen.
The airtight murder case against a racketeer crumbles when McGarrett learns a witness duped him; guest Henry Darrow.
An aged Japanese importer, an ex-spy who may have known the location of a fortune in gold, is slain; guest Lew Ayres.
A youth threatens to use lethal nerve gas to avenge his father's death, endangering Danny and visiting European royalty.
McGarrett's probe of Oriental-art smuggling grinds to a halt when he is charged with possession of one of the items.
The investigation of a stabbed college football star points to a gang-rape cover-up and a U.S. senator's son; guest Richard Masur.
A crime writer finds a body and prompts the reopening of the case of a long-missing youth; guest Eileen Heckart.
A warehouse burglary investigation turns up unusual loot; guests Simon Oakland, Kathleen Beller, Richard Hatch.
A drug smuggling involves an Asian-bound cargo ship and a Honolulu fishing boat; guest Jack Cassidy.
The murder of the airplane seatmate of Danny's aunt (Helen Hayes) is linked to abandoned bank accounts.
Five-0 must protect a singer (Lois Nettleton) whose eyewitness testimony can convict a Hawaiian racketeering kingpin of murder.
A scientist (Pat Hingle) demands immunity for a defecting Asian physicist (Soon-Teck Oh) who had to kill a man in self-defense.
McGarrett allows rebelling convicts, led by an old enemy (Harold Gould), to try him for murder in exchange for release of hostages.
A criminal plots to launch a Russian surface-to-air missile; guests John Colicos, George Takei.
The Honolulu murder of a gambler sends Five-0 in pursuit of a Las Vegas courier; guests Susan Dey, Andrew Prine, Marc Singer.
McGarrett searches for a missing Englishman suspected of passing secrets to enemy agents; guests Juliet Mills, Dan O'Herlihy.
An armed, escaped convict (Charles Cioffi) holds badly wounded McGarrett hostage after their plane goes down in a severe storm.
On his annual naval-reserve cruise, McGarrett must investigate the letter-bombing of a Navy intelligence officer; guests Harry Guardino, David Birney, Donna Mills, Lloyd Bochner.
The letter-bomb murder of a Navy intelligence officer interrupts McGarrett's annual naval-reserve duty.
A scheme forcing travel agents to purchase stolen airline tickets turns to murder when one refuses.
A Saturday Night special leaves Five-0 a bloody trail of murder and misery as it passes from owner to owner.
McGarrett clashes with a police captain over Five-O's handling of a murder/kidnapping; guests Linda Purl, Scott Brady.
McGarrett tracks an assassin and his target to avert a mob war; guests Sal Mineo, Tommy Sands, Nehemiah Persoff.
A heroin smuggler is slain before he can sell information to the police; guests Ed Flanders, Bruce Boxleitner.
A surrealistic painting holds clues to solving a psychiatrist's murder; guests Richard Hatch, Gretchen Corbett.
The $1 million reward offered for five missing figurines leads to robbery and murder; guest Don Knight.
A deputy public defender criticizes McGarrett after he arrests a poor child for a minor theft; guests France Nuyen, Bert Convy.
Three desperate women in dire financial straits rob tour buses at gunpoint; guest Eugene Roche.
A computer programmed with erroneous information points McGarrett's murder investigation to the wrong person.
A Honolulu death is linked to the disappearance of a valuable human fossil from China just before Pearl Harbor; guest Vic Tayback.
McGarrett's investigation of a Japanese banker who committed ritual suicide uncovers an international swindle; guest Ossie Davis.
A traveling circus provides spy Wo Fat with the opportunity to attack a visiting foreign minister who is under Five-0's protection.
A businessman accuses the Five-0 squad of demanding $100,000 in protection money from him; guests Cameron Mitchell, Frank Gorshin.
In his search for the mobsters who injured him, McGarrett becomes romantically involved with a lovely fellow victim.
Irreplaceable French paintings vanish from a millionaire's private collection despite a fail-safe electronic security system.
An autopsy reveals that the victim of a gangland slaying led a double life; guests Jessica Walter, Sam Elliott.
A cattle baron (Leslie Nielsen) seeks revenge when one son (Perry King) says another was killed; guest Bruce Boxleitner.
Liquor-store robberies and shootings seem to be linked to a 5-year-old bank heist; guest Charles Cioffi.
McGarrett investigates written threats on the life of the chairman (William Windom) of a state senate crime committee.
A man sells stolen goods to legitimate industries solely by telephone; guests Ray Danton, Jacques Aubuchon.
A psychopath re-enacts murders featured in an article recounting the team's past crime-solving efforts.
An extortionist threatens to cause a volcanic eruption and destroy the city of Hilo; guests James Olson, Sheree North.
Danny and a college professor are held hostage until two members of a radical group are released from jail.
A stylish jewel thief evades McGarrett and then sends the Five-0 chief an invitation to his next performance; guest David Wayne.
A comedian (John Byner) complicates McGarrett's investigation of a robbery-kidnapping aboard a cruise ship; guest William Devane.
An extremist (Anthony Zerbe) embarks on a deadly crusade against what he sees as law-enforcement leniency.
An investigation of five rape-murders points to the police; guests John Beck, Katherine Justice, Alan Fudge.
A search for sunken treasure leads into the Pacific off Oahu; guests James J. Sloyan, Peter Donat.
A retired narcotics agent's (Andrew Duggan) son (Peter Strauss) is suspected of manufacturing heroin; guest George Kennedy.
A professional killer pursues an eyewitness (Mark Jenkins), using the man's dropped library card as his clue.
A con game targeting wealthy male tourists goes awry when a victim falls to his death from a hotel window; guest Ed Flanders.
The Banzai Pipeline surfing beach is the setting for three murders connected to a film production.
Bank robbers fake a military emergency to cover up their crime, sending Five-0 to the windward side of Oahu to investigate.
A thief (Victor Buono) steals a nickel valued at $100,000, which his panicked accomplice later drops into a vending machine.
A lottery picking the exact hour of a gambler's (Jack Carter) death involves $240,000; guest Louise Sorel.
Conspirators demand $100,000,000 from the government in exchange for not destroying Honolulu with an atomic bomb; guest Lew Ayres.
McGarrett doubts his expert in a case of forged government bonds when authenticated documents lack fingerprints of bank employees.
A Latin American dictator comes to Hawaii to help his kidnapped daughter, but is killed soon after her release; guest A Martinez.
A woman sets up an opal smuggler (Don Knight), who appears to be a reputable jewel merchant, to be robbed of a fortune in gems.
McGarrett uses a mainland undercover agent to stop a scam involving greedy heirs and an insurance company.
The assassination of one of Honolulu's most active flesh peddlers threatens an all-out war between two competing vice empires.
A federal tax agent (Don Porter), posing as a man indicted for tax evasion, murders for $600,000 in stolen money.
A man with classic symptoms of pyromania appears to be the perfect victim of a frame-up for a series of weekend arsons.
A family of small-time killers brings its murderous ways to Hawaii, mystifying the Five-0 unit; guests Slim Pickens, Bo Hopkins.
Five-0 boards a deported mobster's boat (Nehemiah Persoff), unaware both man and vessel may carry plague; guest Bert Convy.
The newspaper comics pages give McGarrett a clue to a series of slayings that come every six weeks and seem to have no motive.
A man who has lost both his hands plans to kill all the police officers he holds responsible.
McGarrett's informant relays that a murder-trial juror has been bribed to produce a hung jury; guest Ray Buktenica.
A cat burglar (Eric Braeden) strikes a prominent family, starting a chain reaction that ends in death.
An extortionist preying on small-business men courts the daughter of one of McGarrett's trusted deputies.
A travel agent who organizes gambling junkets is killed by the competition as a warning to his partner.
Two crooks kidnap a woman's (Nina Foch) only grandchild to a mountain hideout; guests Jackie Coogan, Tisha Sterling.
A shopkeeper (Nehemiah Persoff) becomes the center of a plot to assassinate a defector; guests Mark Lenard, Malachi Throne.
A stockbroker (Richard Basehart) plans to rob $40 million from the Honolulu Stock Exchange.
A suspected killer appears to be in two places at the same time; guests Monte Markham, Madlyn Rhue, Sandra Smith.
A paranoid electronics wizard (Greg Mullavey) threatens a psychiatrist (Robert Foxworth) and his patients.
A jailed mother-to-be (Patty Duke) agrees to testify against a drug dealer if she is released and wed to her baby's father.
McGarrett becomes suspicious when no ransom demands are made for infant snatched on a Honolulu street; guest Meg Foster.
Husband-and-wife swindlers (Andy Griffith, Joyce Van Patten) nearly spark a war between two powerful mobs.
Sympathizers of vigilantes standing trial circumvent security and plant explosives in the courthouse.
The patriarch of the Vashon crime family plots to have McGarrett framed for homicide and jailed in disgrace.
A young member's death prompts the Vashon crime family to order McGarrett's execution; guest Harold Gould.
The scion of a crime family is arrested, but his release sparks a new reign of mob terror; guest Harold Gould.
Injured Danny fights to recall details of an assassination plot against a Chinese diplomat; guests Keenan Wynn, Philip Ahn.
A public-health official is murdered while investigating sexually transmitted diseases; guests Dirk Benedict, Mary Frann.
An Army officer (Clu Gulager) plots to hold a scientist for a ransom of $1 million in diamonds; guest Michael Conrad.
McGarrett suspects criminal genius Wo Fat when a secret missile is stolen and offered to the highest bidder; guest Soon-Teck Oh.
Danny is involved in the shooting of a teenager following a fellow police officer's death; guests John Rubinstein, Louise Latham.
The deaths of wealthy businessmen lead the team to a lucrative blackmail operation; guest William Shatner.
McGarrett suspects a wealthy race car driver's (Ricardo Montalban) fiancee (Diana Muldaur) killed two mechanics.
A crime-solving computer fingers one of McGarrett's men for the murder of a mob figure; guests George Chakiris, Michael Ansara.
The Five-0 team pursues a ruthless killer preying on Army men's wives coming to Hawaii to meet their husbands.
Danny goes under cover as a sailor to crack a drug ring operating from a vessel in the Seventh Fleet; guest David Birney.
A widow is one of the victims in a blackmail plot leading to the murder of a Chicago mobster; guests Joanna Barnes, Simon Oakland.
McGarrett protects a girl whose former boyfriend, an escaped murderer, is threatening to kill her.
The deaths of two disreputable real-estate men, both caused by lethal toxins obtained from a rare shellfish, stump McGarrett.
A murder suspect (Barry Sullivan) is afraid to leave his germ-free yacht, even to clear his name; guest Ed Flanders.
A medical fact leads McGarrett to believe a braggart soldier convicted of assault is innocent.
McGarrett has only 90 seconds to prevent the sabotage of a missile-tracking base; guest Dana Wynter.
Someone is trying to frame McGarrett as a thief; Wo Fat plans to sabotage a missile tracking base; with Dana Wynter.
A gambling chief forces a woman to fake a suicide attempt to bring her fiance out of hiding; guests Loretta Swit, Malachi Throne.
An escaped convict (Hume Cronyn) taunts McGarrett with clues to his theft of $4 million from drug runners.
Island residents are sympathetic to the pranks of an ecology fanatic until he murders polluters.
A mob-backed boxer's hand is smashed by a punch-drunk former prizefighter; guest Moses Gunn.
McGarrett believes a gangland war is imminent when it appears a mainland syndicate is trying to take over.
A man claiming he will kill an unnamed, important person within 48 hours calls McGarrett and leaves clues.
McGarrett suspects a doctor (Jackie Cooper) in his wife's murder.
Five upstanding citizens seek revenge by carefully planning a $6 million theft; guest Sam Melville.
McGarrett discovers an air cargo hijacking ring while investigating the death of an airport security guard.
A psychotic sniper endangers the lives of motorists as he fires at cars from a hillside bunker overlooking a major highway.
A mugging victim (Vic Morrow) arouses McGarrett's suspicion after refusing to press charges and disappearing from the hospital.
Murder curbs a crafty college professor's (Buddy Ebsen) plan to cash $750,000 worth of stolen traveler's checks.
A private detective (Monte Markham) helps Five-0 after his wife becomes a victim in a series of bizarre killings.
Five-0 must stop a mobster enabling a mainland crime syndicate to infiltrate Hawaii; guest Henry Darrow.
When two corpses are found at an archaeological dig, it reopens a 10-year-old missing-persons case; guest France Nuyen.
A baseball player's son is too frightened to tell anyone about a murder he saw in a ballpark; guest Pernell Roberts.
A vengeful man who blames Danny for his brother's death seizes Five-0 headquarters and then reveals that he is a walking time bomb.
A woman (Vera Miles) falsifies evidence to link two murders and force a new investigation of her husband's homicide conviction.
A munitions dealer (Paul Burke) arranges his wife's kidnapping to force a government to pay a higher fee for an arms shipment.
The team deals with murder and treason while searching for plates for counterfeit $20 bills; guest Roger C. Carmel.
Foreign and U.S. agents search for nearly perfect plates for counterfeit $20 bills; guest Roger C. Carmel.
Army intelligence hampers Five-0's investigation of the death of a combat hero returning from Vietnam; guest John Anderson.
A gangster breaks a convict out of prison so that he can plan a robbery of the Honolulu Diamond Exchange; guest Tim O'Connor.
McGarrett's investigation of the death of a real-estate agent eventually leads him to the island of Maui; guest Royal Dano.
A convicted murderer (Monte Markham) demands Five-0 prove him innocent in exchange for the life of his hostage, a prison doctor.
McGarrett tries to save a hoodlum and his girlfriend, who together stole a kidnap ransom; guests Albert Salmi, Joyce Van Patten.
The team seeks a killer who inscribed lines from Byron on the legs of his victims, one of them Danny's fiancee; guest Ann Archer.
A master burglar (Hume Cronyn) reports his crimes to Five-0 and dares McGarrett's team to find sufficient evidence against him.
A nightclub star/ecology crusader is framed for sabotage and murder committed in a sewage-treatment plant; guest Paul Stevens.
McGarrett searches for a murder witness, a girl previously presumed dead, who is also pursued by the prime suspect in the killing.
Reunited members of a U.S. Air Force squadron accuse a wealthy businessman of having been a Japanese war criminal.
Evidence indicates a boat explosion that killed a businessman and injured McGarrett may be one in a series of similar cases.
An attempt to rescue a kidnapped boy goes awry when Kono becomes the abductors' new hostage; guests Andrew Duggan, Peter Bonerz.
The theft of a Soviet musician's priceless violin threatens to escalate into an international incident; guest Ed Flanders.
A woman (Diana Muldaur) McGarrett almost wed becomes a prime suspect in the murder of her husband; guest Martin Sheen.
A a self-exiled Greek doctor and a news correspondent who arrives to interview him are targets of assassins.
Contaminated heroin destroys a fading singer's (Nancy Wilson) comeback; guest Harry Guardino.
Foreign agents critically wound a U.S. official after he returns from the People's Republic of China; guest Gerald S. O'Loughlin.
A beautiful thief (Joanne Linville) posing as a socialite schemes to steal a Hawaiian royal jewel; guest George Gaynes.
The Five-0 team has 12 hours to learn where a scientist (Ed Flanders) hid a vial of deadly mutant microbes.
A scientist (Ed Flanders) vanishes after discovering a deadly biological mutation.
A renowned research scientist, conned into believing he shot and killed a man, disappears from his important government assignment.
A grief-stricken policeman takes the law into his own hands after his wife is murdered; guests Tom Skerritt, Sam Melville.
One of McGarrett's most trusted investigators is accused of accepting a bribe from a major narcotics dealer; guest Martin Sheen.
An angry man seeks revenge after a crooked poker game costs the life of his honeymooning brother; guests Jack Soo, John Colicos.
Someone is deliberately tormenting a disturbed Vietnam veteran guilty of kidnapping.
McGarrett clashes with the Navy when he tries to bring in a suspect in a shore patrolman's murder; guest Christopher Walken.
The girlfriend of a fitness guru dies while attempting a hanging-type exercise.
An order from the governor is necessary to stop blinded McGarrett from pursuing the assailant responsible for his loss of sight.
An adversary (William Windom) of McGarrett's pulls off the perfect heist in front of Five-0; guest Jackie Coogan.
A Texas heiress (Beverlee McKinsey) pits a beachboy against a playboy in a bizarre card game in which their lives are the stakes.
After his kidnapped son escapes, a wealthy man demands McGarrett recover the $300,000 ransom he paid to the boy's abductors.
McGarrett must protect a dictator whose jet made a forced emergency landing in Hawaii; guest Paul Stevens.
McGarrett's investigation of a former mobster implicates a state committee head; guests James Gregory, Keye Luke.
A woman, the only witness to a murder by a wanted Hawaiian crime figure, asks McGarrett to come to Singapore and escort her back.
A prank turns serious when university students who stole the cherished robe of King Kamehameha decide not to bring it back.
A foreign agent (Theodore Bikel) threatens germ warfare and the end of Hawaii's sugar industry; guests Philip Ahn, Soon-Teck Oh.
A radical Maoist attending college in Hawaii is found dead as evidence links him with a Chinese intelligence operation.
Members of a small, foreign guerrilla force burglarize an armory to steal weapons for a revolution in their country.
A small-town salesman witnesses a prostitute's murder but refuses to testify; guest Elaine Joyce. Directed by Nicholas Colasanto.
Agents of the People's Republic of China use a false tidal-wave forecast to mask the kidnapping of a scientist (Will Geer).
A deranged Japanese man returns to Hawaii to complete his mission to destroy Pearl Harbor; guest Mark Lenard.
Three wives of men killed in Vietnam die after collecting their husbands' G.I. insurance; guests Harry Guardino, Loretta Swit.
Visions of an ancient volcano goddess figure in plans to kill an old man to gain control of his land; guest Sally Kellerman.
Chin Ho and Dan Williams are tracking a safecracker but he pulls a gun and Danno ends up shooting him. McGarrett takes the identity of Harry Brown and must infiltrate a sophisticated gang of international thieves.
McGarrett must determine whether the leader of a peace movement who was shot and killed was the assassin's intended target.
Despite public sentiment and a lack of damaging evidence, McGarrett takes Dr. Fremont (Joanne Linville) to court.
McGarrett travels to Los Angeles to investigate a physician who is victimizing his sister and her child.
A policeman wants to avenge the murder of his son, a prizefighter paid to fix a bout; guest Jesse White.
Employees of a family-owned business are threatened and the company's matriarch vanishes; guests Farley Granger, Jeanette Nolan.
McGarrett offers himself as a hostage in an attempted prison break by two 'lifers'; guests Gavin MacLeod, Gerald S. O'Loughlin.
A man carrying bubonic plague arrives in the islands the same time as plans for a top-secret weapon vanish; guest Jackie Coogan.
A girl dies under the influence of drugs possibly supplied by a self-proclaimed guru; guest Ed Flanders.
A Marine veteran (Yaphet Kotto) suffers a breakdown and, believing he is back in Vietnam, takes Danny hostage in a hospital ward.
A large footprint and a circular mark made in mud provide Five-0 with the only clues to a lovers' quarrel that turned into murder.
Five-0 fights to save the life of gangster so that he can testify against his boss; guest Nehemiah Persoff, James Shigeta.
Danny takes over and starts a desperate search for clues after McGarrett is felled by an unknown assailant.
An Army corporal is accused of a crime after a winning ticket in a numbers game turns out to be a loser; guest James McEachin.
A singer (Tommy Sands) turns to cat burglary when his musical efforts fail to satisfy his mounting gambling debts.
McGarrett goes under cover in a California prison to find the connection between a girl's death and the theft of a gem collection.
The owner of a tuna boat uses his craft to smuggle gold bars into the islands; guest Paul Richards, Marj Dusay.
The Five-0 team works overtime when Danny is indicted for the murder of an apparently unarmed teenage boy; guest Gavin MacLeod.
McGarrett must protect an underworld kingpin (Ricardo Montalban) he is trying to convict of racketeering activities.
A publicity stunt by a rock singer (Sal Mineo) to stage his own kidnapping backfires when ransom is offered; guest Sam Melville.
An official's death involves strange clues, including a woman with a camera and a man with a briefcase; guest Simon Oakland.
The Hawaiian governor assigns McGarrett to break a ring of con artists swindling visiting rich widows; guest Kevin McCarthy.
McGarrett's investigation of an old friend's drowning points to a foreign ship moored in a Hawaiian harbor.
McGarrett investigates the death of a friend when it becomes apparent that the man did not drown as was commonly believed.
Zar mafioso hace que chica crea que fue violada para que su enamorado salga de escondite.
Billonario excéntrico es sospechoso de haber matado a uno de sus socios de negocio.
Danny se hace pasar como marinero para descubrir círculo de drogadictos.
Miembros de una firma de finca raíz se convierten en las víctimas de unos mariscos envenenados.
Hombre convicto de asesinato escapa de la prisión y amenaza con matar a ex enamorada.