In the first four years of the show's existence, Wo Fat made nine appearances. In "Hawaii Five-O: Cocoon" (September 20, 1968), the series pilot, Wo Fat, as a Chinese spy, uses sensory deprivation to crack the most loyal U.S. intelligence agents to give up top secret information. He was absent from the show for a year, but then made eight appearances over the three-year period from October 1969 to October 1972. In these appearances, Wo Fat continues his position as a top Chinese intelligence agent in the Pacific, whose duties include running Chinese spy missions in Hawaii. Wo Fat's appearances during this period are: "Forty Feet High and It Kills!" (October 8, 1969), "A Bullet for McGarrett" (October 29, 1969), "And a Time to Die..." (September 16, 1970), "F.O.B. Honolulu: Part 1" (January 27, 1971), "F.O.B. Honolulu: Part 2" (February 3, 1971), "The Ninety-Second War: Part 1" (January 18, 1972), "The Ninety-Second War: Part 2" (January 25, 1972), and "The Jinn Who Clears the Way" (October 10, 1972),