An Irish terrorist uses disguise and deception in order to be able to smuggle explosives for the Troubles.

McGarrett engages in a personal struggle to clear the record of an officer and close friend accused of criminal activity.

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

Five-O's world is shattered when mobsters catch Chin Ho undercover and order him to be killed.

Two rival mobs attempt to take control of the disco scene in Honolulu.

The rival gangs are on the brink of all out war, and Five-O must struggle to stop them.

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

A private detective is rescuing girls from prostitution, and using the opportunity to kill the pimps as well.

When a woman dies due to heroin packets bursting inside her and the Governor is implicated, McGarrett and Danno head off to Singapore to discover a smuggling operation.

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

McGarrett and Kimo must stop a gang of trained assassins from disrupting a meeting of energy ministers.

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