Hawaii Five-O - Season 6 (1973)

A somewhat odd family comes to Hawaii and embarks on a criminal rampage. McGarrett can find no pattern to their activities until information from the mainland shows they rob and kill random targets without a second thought.

A series of arson fires has Honolulu on edge. Each fire occurs on Sunday and despite patrols by Hawaii Five-O and HPD, authorities haven't been able to catch the arsonist. So far, no one has been injured. It turns out the fires are part of a plan by a businessman who is going to have his own company burned down so he can collect the insurance money. The earlier blazes were to establish "the Sunday Torch" M.O. and to find a suitable dupe.

A rogue IRS agent on the trail of a tax evader catches him in an airplane lavatory - and strangles him. The agent's real motive for the murder was to find and keep $600,000 the dead man was carrying in a suitcase. Then the suitcase is mistakenly picked up at Honolulu Airport by a flight attendant. The agent tracks her down and murders her as well, but once again it's the wrong suitcase. Two mainland tourists have the money and the IRS agent - who has joined Five-O as a special agent on the trail of the hot money - uses the police resources to go after them.

A war breaks out among the pimps in Honolulu, resulting in several murders.

Five-O investigates a company that promises heirs an early payout from wills of rich, elderly relatives. The company has been taken over by new owners in recent years and a trail of abrupt deaths has developed. McGarrett recruits a lawyer to go undercover as a high-living heir as Five-O seeks to end the killings.

Hobbs, a miner from the Australian Outback, comes to Hawaii to sell opals he has dug up. Hobbs' secret is that he is actually carrying a much larger and immensely more valuable cache, which he smuggled through customs after showing them his display items. When he negotiates with a jeweler, a robber bursts in and steals all of the gems. Hobbs tells Five-O about the theft of his small items, leaving out the bigger picture. He suspects (correctly) that the robbery was an inside job pulled off by associates of the jewelry-store owner. Hobbs finds the holdup man and kills ...

The daughter of a dictator is kidnapped from the University of Hawaii campus. The conspirators are young people committed to overthrowing the dictator, known as El Diablo. One of the conspirators is El Diablo's illegitimate daughter from an affair and resembles the daughter. After El Diablo is assassinated, the question is whether Five-O can save the daughter.

Norman Cargill, an old friend of McGarrett's who has provided help in authenticating documents, gets tired of walking the straight and narrow for a peanuts salary (he is also going blind). When he's asked to verify a shipment of highly valuable bonds, he agrees -- and carefully starts copying them by hand to create bonds which he can keep and redeem. McGarrett could sympathize if that is all Cargill did, but then Cargill kills two people who want in on his secret. McGarrett reluctantly orders an intensive survey on Cargill, who figures it out and indignantly protests ...

An entity calling itself Mercury threatens to explode an atomic bomb in Honolulu unless it's paid $100 million. Five-O enlists the aid of a nuclear physicist to find the bomb and apprehend the elusive mercury.

A chronic gambler, pretending he has cancer, sells chances on the hour of the day he will die at $10,000 apiece. The winner gets all 24 tickets. The gambler actually doesn't have cancer (he has Lou Gehrig's disease, ALS, instead), and plans to commit suicide at an appointed time so that a specific person will get the money. But as the gambler talks to his doctor outside a party, the doctor is gunned down and the gambler is forced to take his fatal drug. The gambler's corpse is then placed in a car and driven to a remote location, where the hot sun makes it impossible ...

A rare 1913 Liberty Head nickel, one of only five ever made, is to be auctioned at a coin show held at the Ilikai Hotel. European master criminal Eric Damien gets con artist and sleight-of-hand expert, Arnie Price, freed from jail so that he can switch a cleverly-made fake with the original before the auction. But things do not go as planned, as Price, fearing capture, tries to dispose of the nickel in a news rack, and the chase is on to recover the nickel before anyone else finds it.

Four men, posing as Army specialists whose truck overturned and spilled cannisters marked as deadly VX nerve gas, evacuate a small town on Oahu's remote north coast. That evacuation includes the bank, which the criminals then saw into and knock over for a fortune. McGarrett immediately orders a roadblock on the only highway up that side of the island, stranding the bank robbers far from any point of escape. McGarrett mans Five-O headquarters (he's absent from the action for most of this show) while Danny, Chin and Ben go op to investigate. The two mainland "haoles," a...

Greggs, a land developer, has a zoning man, Huffman, in his pocket. As Huffman has started offering his services to other developers, 5-0 has built a case against him. Greggs, knowing that Huffman will turn on him to save himself, calls him telling him to meet him. Greggs sends one of his men, Koa, to kill Huffman. Koa was about to leave when a car drives off. A filmmaker had seen Huffman's car and taken the dead man's wallet but dropped one of his film cans. Koa finds it and gives it to Greggs, who has it developed and sees that it is footage of the area near the ...

Con-artists arrive in Hawaii and meet up with local thieves to plan a phony diamond con. When a wealthy tourist devastated by the con leaps to his death, McGarrett discovers he is one of many victims. As another angry victim seeking revenge and Five-O close in on the gang; the crooks turn on one another.

Five-O races to find the witness to a hit on a bagman of a local mob. The witness, who narrowly escaped being killed himself, had dropped a library book with his library card inside, providing the hitman with the name of the witness. The witness's wife doesn't want him to go to the police. Five-O's main clue is a letter the witness wrote to the Honolulu Star-Bulletin's "Secret Witness" feature that seeks tips for unsolved crimes.

McGarrett joins a group of operatives trying to take down a major drug lab in the hills. The raid succeeds, but a young man smashes through a cordon in a truck and escapes. Word of the raid soon reaches a retired HPD cop, who realizes the escapee is his own son. The cop starts sneaking into evidence rooms and destroying or stealing anything which can implicate the son. Meanwhile, the son is still working as a drug dealer and holes up in another lab used to make methamphetamine. The title of this show is to be taken literally.

A private detective, and former HPD officer, turns up dead. Following his trail, Five-O discovers the private detective was investigating whether a businessman's son-in-law was being faithful in his marriage. It turns out the son-in-law is up to his neck in a scheme to steal gold from the businessman, melt it and recast it and make it appear to be a treasure find. Things will turn more deadly before Five-O can crack the case.

Steve and the team are looking for the man who is sexually assaulting and killing women. He's killed four and there are no leads. His latest victim doesn't die but is unwilling to help. Steve knows that a couple of the victims were having problems with their cars so he places policewomen in position and to await him to make his move. But when a cop approaches one of them, she tells him that she's on a stakeout so he leaves. But when they realize the cop is the one they are looking for because the victims either went with him in his car or allowed him to enter their ...

A vicious law-and-order zealot becomes inflamed by various thugs getting off the hook in court on technicalities. So, using an alias, the man sends a letter to McGarrett promising to blow away the next criminal who takes a walk -- naming a specific hood in particular. The criminal walks and is drilled right in front of the courthouse. As a public debate rages on vigilante "justice," the killer sends McGarrett another note, expanding his hate list to the judges who order charges quashed on technicalities. A judge (Frank Cady of Hooterville fame in a very rare serious ...

McGarrett and Williams board a cruise ship to find a man involved in a fatal shooting at a bank.

Five-O matches wits with a brilliant thief who's a master of disguise and able to manufacture his own pass keys to Honolulu hotels. The thief has information on guests with valuables and how they try to hide them in their rooms. He even calls the police while disguised as a priest claiming to be robbed himself. The question is whether McGarrett & Co. can catch up to the thief.