A research scientist, Dr. Royce, is set up by revolutionaries to be transported away from the islands in a submarine. McGarrett must stop this from happening and also has to contend with the interference of federal agents in the case.
Police officer Lew Morgan and his wife are long-time friends of Danno. When she is murdered, Morgan sets out to find the culprit. He uncovers secrets that may have led to her death, putting a strain on his friendship with Danno.
Don Miles, a "health freak", uses a hanging-type exercise to promote his well-being. His girlfriend Wanda tries it and apparently dies in the attempt. McGarrett discovers that foul play may have been involved. NOTE-This episode is not available for television syndication packages due to the controversial content. A viewer reportedly imitated the hanging "exercise" and died.moreless
McGarrett is blinded in a car bomb explosion. As the Five-O team searches for the would-be assassin, McGarrett tries to recuperate with the help of a tough nurse, Edith Lavallo (played by Marion Ross of "Happy Days" fame).
An assassination attempt on a prominent politician, Charles Irwin, leads Five-O to Mike Finney, a former racketeer who has been clean for nine years. Finney insists that he is innocent, and the trail of clues leads back to Irwin.
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.
A tsunami warning is called and a geneticist is evacuated from a conference. He is then kidnapped under the orders of Wo Fat, but he uses his diabetic medical condition as a ploy to stop Wo Fat from carrying out the plan to return him to China.
An army sergeant and a municipal worker run a scam in which they use local bar women to claim G.I. widow benefits. Sgt. Simms then kills the women, motivated by both the cash and his desire for revenge since his brother died after an encounter with a "gold-digging" prostitute. McGarrett and company must use other women in the bar to help them uncover the scheme.moreless
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