McGarrett sends an undercover agent into a rehabilitation home for juvenile offenders to find out who is behind the theft of gold from dental supply warehouses.

A gang of thieves steal army rifles by peculiar means - hang-gliding into the armoury!

Five-O must close the heroin smuggling operation to exonerate the Governor and catch the figures behind the scheme.

The series concludes with the final showdown between McGarrett and Wo Fat. Three scientists have gone missing. They have one thing in common: they all attended a symposium that discussed a possible space-based, laser defense system. McGarrett impersonates a fourth scientist, Dr. Elton Raintree, who attended the same gathering and is soon abducted. Wo Fat is behind it all and wants the scientists to complete their work and produce such a device.

A group of high society men set out to see that justice is done - the catch being that it is justice on their terms only...

A group of seemingly harmless birdwatchers are the target of a vendetta. Five-O must discover why they were a target and stop any further violence.

A aging crook decides to use dollar bill printing plates he made to raise cash for a charity, but he fails to realise the trouble that this will cause.

In order to find out the identity of the murderer of a union leader, McGarrett goes undercover as a longshoreman.

Steve is framed on the orders of a gambling syndicate, and becomes involved with a woman who is part of the case.

When a rich socialite is kidnapped, her husband insists that Five-O stay out of the case. However, his reasons may not all be on the level as events take a series of twists and turns...

A Japanese World War II veteran, Yoshio Nagata, escapes from a mental hospital and tries to carry out his wartime orders to blow up a refinery.

When a woman is stalked by a strange figure, she seems to be seeing things and her friends are worried as to her mental health. However, events prove her case and an accomplice is revealed...

A group of terrorists capture a female officer and use her to further their aims, and McGarrett and the team must find a way to take them out without endangering the life of Officer Dean.

A young man on vacation has strange visions that lead him to the site of an old murder and help him discover a lost family.

A gang of clever students use radio-controlled planes to execute the theft of Queen Liliokalani's jewels.

When the son of McGarrett's sister falls ill with cancer and she becomes involved in ‘naturology', her husband calls in Steve to investigate and persuade her to stop paying for the useless treatments. However, the quack doctor sets up a court case to prevent McGarrett from closing her practice.

While searching for parts from a sunken Soviet submarine, McGarrett become suspicious about the particular parts that are being recovered.

A Japanese businessman comes under attack from a young man whose father suffered in an Japanese Prisoner of War camp.

An assassin who doesn't know he's an assassin? Sounds like a punch line from "The Naked Gun," but it's the story of this episode, where a diplomatic courier with a briefcase chained to his wrist is hypnotized and programmed to rig the case with a bomb. When Danno goes undercover to ferret out the assassination ring, he himself is brainwashed and programmed to kill McGarrett.

The death of a prominent politician reveals a strange love triangle.

A vacationing heiress seems unconcerned when McGarrett warns her that someone is after her ruby.

When two surfer bums use a gun to rob a shop, it starts off a trail of death and misery involving children, politics and blackmail.

Don Miles, a health freak, uses a hanging-type exercise to promote his wellbeing, but his girlfriend Wanda tries it, and seemingly dies in the attempt. However, all is not what it seems…

Five-O must deal with the plans of a Neo Nazi organisation to kill Bobby Tamara, the ""Hawaiian Kennedy"".

Tony Alika and Guido Marioni, killer of Kimo's family, together hatch a plot to frame and embarrass the Five-O team by making them look stupid or corrupt.