1h - Five-O is confronted with the problem of corralling foreign agents responsible for critically wounding a U.S. government undercover agent upon his return from a 10-year mission in Red China.
1h 15min - Contaminated heroin shatters a failing singer's desperate attempt at a comeback. Caught in the same quagmire of crime is the singer's drummer friend who dies from the toxic dope; Mike, who offers much needed help to McGarret.
1h - McGarrett must thwart an elaborate assassination attempt on the life of a self-exiled Greek doctor.
1h - A tender memory in McGarrett's past is suddenly shaken when his former fiancée, Cathy Wallis, finds her husband slain. McGarrett becomes personally involved in the case and jeopardizes his job when Cathy becomes the prime suspect.
1h - The theft of a priceless violin belonging to a Russian musician touring in Honolulu threatens to explode into an international incident
1h - The efforts of McGarrett's Five-O police unit to rescue a wealthy young boy from his ransom-hungry abductors backfire when McGarrett's own man, Kono, also becomes a prisoner of the thugs. Kono helps Timmy escape, but is unable to make a getaway himself.
1h - A millionaire businessman is accused of being a former Japanese officer responsible for extreme physical and mental cruelty to U.S. World War II prisoners of war.
1h - McGarrett leads an all-out search for the witness to a two-year-old murder in order to protect her from Harry Quon, one of Hawaii's most-wanted criminals and the crime's prime suspect.
1h - A strangler who writes the poetry of Byron in lipstick on the legs of two victims, one of them Danny's fiancée, must be stopped in time to prevent a third murder.
1h - Steve McGarrett must apprehend a hoodlum and his girlfriend in order to save their lives. The two are being sought by two men from whom they stole a large cash ransom which they acquired by carrying out an abduction.
1h - Monte Markham plays convicted murderer Harry Kellem, whom Five-O must try to prove innocent in order to save the life of a prison doctor who Kellem is holding hostage
1h - McGarrett's investigation into the death of a real estate agent leads to the island of Maui.
1h - Almost-perfect counterfeit plates for U.S. twenty dollar bills are desperately sought, not only by American but by various international agents as the ultimately successful trail leads to Hawaii where Five-O must deal with murder, treason and doublecross.
1h - An investigation by Five-O reveals that a munitions' dealer has arranged for the kidnapping of his own wife so that he can induce a beleaguered government to pay a higher price for an arms shipment.
1h - Vera Miles guest stars as a wife who fakes evidence appearing to link two murders, in an attempt to trick McGarrett into reinvestigating the homicide charge for which her husband was convicted.
1h - An armed lunatic who blames Danny Williams for his brother's death invades Five-O headquarters seeking revenge, takes four people hostage, booby-traps the door with dynamite, and reveals that he, himself, is a walking time bomb.
1h - The son of a professional baseball player is witness to a murder that takes place in a ballpark, but he's too frightened to tell his father or the authorities.
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