Air date - Fri 12th of September 1975
When a letter bomb kills a Naval Officer whilst McGarrett is on Navy Duty, he is called upon to investigate and uncovers a plot involving an old nemesis...
Air date - Fri 12th of September 1975
McGarrett must try his utmost to foil Wo Fat's plans which include hostages and brainwashing.
Air date - Fri 19th of September 1975
McGarrett must again face mobster Charlie Bombay when a plane carrying them to Honolulu crashes in the forests.
Air date - Fri 26th of September 1975
A British agent, Harry Wells, arrives in Hawaii in pursuit of a turncoat, but not all is what it seems for Five-O...
Air date - Fri 3rd of October 1975
Five-O must find a female courier who witnessed a murder before a hitman can...
Air date - Fri 10th of October 1975
A road accident starts the trail towards a plot to use SAM missiles to bring down a VIP jet plane.
Air date - Fri 17th of October 1975
McGarrett offers himself as a hostage exchange, but is then put on 'trial' by Honore Vashon.
Air date - Fri 24th of October 1975
McGarrett meets his match in Dr. Grant Ormsbee, a grumpy and aggravating scientist who is sheltering a suspected Chinese defector.
Air date - Fri 31st of October 1975
When a singer witnesses a murder committed by a racketeer, Five-O has to protect her until she can give evidence, but this is not an easy job...
Air date - Fri 7th of November 1975
Danno's Aunt Clara becomes acquainted with a man on the plane to Honolulu, but becomes concerned about him afterwards. Dan, Steve and the others ignore her at first, but then the man turns up dead...
Air date - Fri 14th of November 1975
A vice-principal enlists the help of his students and a submarine to smuggle drugs.
Air date - Fri 21st of November 1975
When Five-O fail to prevent a series of thefts at dockside warehouses, an influential owner creates trouble for McGarrett.
Air date - Fri 28th of November 1975
A writer who specialises in solving mysteries uncovers the body in a seven year old case, but it raises more questions than it answers...
Air date - Thu 4th of December 1975
Three boys commit a gang rape on a waitress, but one is the son of a Senator and the crime is covered up...
Air date - Thu 11th of December 1975
Whilst trying to stop the smuggling of small Oriental animal statues, McGarrett is caught illegally in possession of one of them as part of his personal collection.
Air date - Thu 18th of December 1975
A disturbed young man steals nerve gas to use against a visiting royal family as revenge for the death of his father.
Air date - Thu 1st of January 1976
When an elderly importer who was a World War II Japanese spy is killed, Five-O seeks his killer.
Air date - Thu 8th of January 1976
A clear cut murder case against an island mobster is derailed due to McGarrett.
Air date - Thu 15th of January 1976
A crooked contractor and a buildings inspector are under suspicion after the new Global Trade Center in Honolulu goes up in flames.
Air date - Thu 29th of January 1976
When an airline stewardess and a hang-gliding instructor are murdered, Five-O must find the killers.
Air date - Thu 5th of February 1976
Criminals threaten to use a special type of moth to wipe out the sugar cane on Hawaii and destroy the industry.
Air date - Thu 12th of February 1976
The son of a Japanese businessman is kidnapped and held in a capsule underwater until a $1.5 million dollar ransom is paid...
Air date - Thu 26th of February 1976
Ben Tanaka, a well-known ecologist, seems to be behind the kidnapping of a wealthy land developer's wife, but all is not as it seems and a conspiracy gradually reveals itself.
Air date - Thu 4th of March 1976
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.