 Hawaii Five-0 is the name of a special police unit consisting of no more than four men at a time, although it can freely call upon the Honolulu Police Department for more men if needed. Answerable only to the governor, Five-0 investigates the most important and sensational crimes, ranging from murder and kidnapping to terrorism and international espionage. Five-0 s leader is ex-Navy Intelligence investigator Steve McGarrett, a tough Irish cop possessed with a determined nature, a hatred of crime and an elaborate bouffant hairdo. Other Five-O personnel included Dan Williams, second-in-command and "Dan-O" to McGarrett; pipe-smoking Chinese Chin Ho Kelly, native Hawaiian Kono; Samoan detective Ben Kokua; and Hawaiian Duke Lukela, who worked his way up from patrolman. McGarrett s archenemy was Red Chinese agent Wo Fat, whose plans were always thwarted by McGarrett, and who always managed to escape the reach of the law--at least until the final episode.