An Irish terrorist poses as a priest in order to buy bombs and weapons in Hawaii for use in his home country.

Guest star: Stephen Boyd.

McGarrett teams with a Navy commander ( Mark Lenard) to search for a cargo ship hijacked by armed and dangerous men.

Guest stars: Mark Lenard and Rossano Brazzi.

When a magazine reporter writes a story about Five-O, McGarrett tries to discreetly locate two missing children.

Rookie cop Joey Kalima is framed for departmental corruption by a group attempting to rob a bank.

Guest stars: John Rubinstein, Alan Oppenheimer and Elaine Giftos.

A mysterious intruder kills two members of an archaeological dig that is attempting to find a king's burial site.

A recovering alcoholic ex-cop puts his life in danger after he returns to Hawaii to make amends to McGarrett.

A reporter investigating a sleazy real estate developer is murdered, but the developer has an air-tight alibi.

A Soviet tennis star is caught up in a murder after she decides to defect to be with her American boyfriend.

Guest star: Kurt Russell, Tim Matheson and Stefan Gierasch.

A Soviet spy ring led by a femme fatale kidnaps an engineer on a nuclear sub and steals classified data.

A group of students create a fake tsunami so that they can rob a bank after the city is evacuated.

After an Asian diplomat drowns in a pool, his wife is convinced forces from their home country are responsible.

Guest stars: Sian Barbara Allen, Marisa Pavan, Michael Durrell and Bill Edwards.

The Governor asks a reluctant McGarrett to investigate the kidnapping of a racist shipping-magnate's daughter.

A physician is shot to death on a remote island and a young doctor from a local clinic is the prime suspect.

A candidate to head a longshoreman's union is murdered in broad daylight, yet there are few clues about the crime. With few leads, McGarrett decides to locate the girlfriend of the murdered candidate, whom he believes has vital information about the crime, by going undercover.

A Congressman cheats on his wife while judging a beauty contest, and is blackmailed by a dangerous man.

Guest stars: David Birney, Soon-Tek Oh and Doug Mossman.

McGarrett teams with an FBI agent after the syndicate sends a hit man to kill an organized-crime informant.

When judging a surfing contest, Danny investigates the murder of a competitor's two-timing girlfriend.

Guest stars: Lisa Eilbacher and Moe Keale.

After one of Five-O's undercover men is shot in the back, McGarrett enlists a Maui policewoman's help.

A young man seeks revenge on a Japanese American businessman who once tortured his father in a Japanese prison camp.

The heirs to a wealthy murdered artist are now falling victim to lethal booby traps set in their prized possessions.

Five-O is summoned after a mystery writer investigates a fraudulent, and murderous, cryogenics outfit.

Guest stars: Mildred Natwick and Peter Lawford.

A reporter from an Italian magazine unearths a plot to kidnap a visiting Middle Eastern princess. (Similar to episode "The Cop on The Cover")

After the body wealthy rancher is found in a burning cane field, his widow becomes a prime suspect.

Guest stars: Andrew Prine, Laraine Stephens, Ted Markland and John Hillerman.

When the Five-O team suffers a devastating loss with its close-knit ranks, an enraged McGarrett asks a Hawaiian organized crime boss for help.