Summer 1974 - Clever, violent criminals outsmart Five-0 in a crime wave that keeps the detectives off-balance with injuries and unusually cunning methods.
April 1976 - After both officers are injured on duty, a friendly (?) competition ensues over who is more fit to return to duty -- McGarrett or Williams. .
July 1972 - Obsessive fanatics are found on both sides of the law when a radical North Vietnamese officer leads a band of followers on a reign of terror in Hawaii.