1h - McGarrett is puzzled when a computer programmed to help solve the slaying of an underworld figure's business associate indicates that the culprit is one of McGarrett's own people — Duke.
1h - Danny is involved in the shooting of a teenager following a fellow police officer's death; guests John Rubinstein, Louise Latham.
1h - Khigh Dhiegh returns as the sinister criminal genius Wo Fat to match wits with McGarrett. A petty criminal is slain during the theft of a secret ballistic missile device, and McGarrett suspects that his arch nemesis, Wo Fat, is behind the theft.
1h - Army officer Jack Gulley, played by Clu Gulager, devises a bizarre scheme to kidnap a top government scientist and collect a ransom of one million dollars in diamonds.
1h - The slaying of a public health official while conducting an investigation into venereal disease leads McGarrett into the world of politics and intrigue. Jay Stewart and Mary Frann guest star.
1h - Keenan Wynn guest stars as the trusted friend of a Chinese diplomat who is the object of an assassination plan which Danny Williams stumbles upon, but whose details he cannot remember when he is injured.
1h - A family-dominated crime syndicate comes to the surface again after a long period of dormancy.
1h - An infant is taken from his stroller on a Honolulu street as McGarrett and his Five-O forces wait unsuccessfully for a ransom demand in order to trap the kidnappers.
1h - Patty Duke and Carol Lawrence are the guest stars as McGarrett goes after the untouchable king-pin of narcotics traffic in the islands.
1h - Dr. Eric Fowler, a psychiatrist, becomes the victim of an extortion effort by a clever paranoiac found too disturbed to treat.
1h - McGarrett and Danny Williams must solve the riddle of how a suspected killer can appear to be in two places at one time. The investigators appear to be at an impasse — until faint clues are developed to throw the light of reality on the crime.
1h - Richard Basehart plays the mastermind behind a 40-million-dollar conspiracy to rob the Honolulu Stock Exchange. Basehart, as Murdock, senior partner in a stock exchange firm, conceives a daring and seemingly foolproof plan to rob the exchange.
1h - Nehemiah Persoff plays an obscure shopkeeper who calls himself Peter Winkler and becomes the catalyst in a plot to assassinate a high-level Iron Curtain defector.
1h - McGarrett attempts to crack an extortion ring preying on small businessmen. The detective's investigation seems to run into a roadblock when it is learned that one of the gang members is courting the daughter of Chin Ho.
1h - A cat burglar strikes at the home of a socially prominent island family, setting off a fast-moving series of events that lead to a death. McGarrett's search for clues takes him to a rundown neighborhood.
1h - A police informer tells McGarrett that one of the jurors in the murder trial of island strong-arm has been bribed in an effort to produce a hung jury.
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