 Al Harrington s first episode as Ben is also the one which introduces where Duke Lukela and John Manicote as semi-regulars. Manicote launches an investigation of Five-O when Duke, an HPD sergeant who is frequently used on Five-O cases, is accused of being a cop on the take. McGarrett does what would be now called an intensive database search, with numerous records on all Five-O team members transferred to projection slides and put up on the screen (if you can freeze-frame or slow your player to catch all of them, there is a wealth of information on the characters -- including McGarrett s birthday, which is in the wrong month!). Convinced that Duke was set up by someone, McGarrett repeats the process with members of Manicote s office and finds that one of the Assistant District Attorneys is a mole planted long before by the mob to discredit the office. Guest star Michael Ansara, playing the mob boss, forsakes his toupee (he s shown swimming) and is very bald in this episode.