A failed Quinn Martin pilot for a series starring Roy Thinnes, as Hawaii-based government counter-intelligence agent, codename; Diamond Head. In this, his only adventure, Diamond Head has to... Read allA failed Quinn Martin pilot for a series starring Roy Thinnes, as Hawaii-based government counter-intelligence agent, codename; Diamond Head. In this, his only adventure, Diamond Head has to prevent enemy agents from stealing a deadly nerve gas and its sale to foreign powers.A failed Quinn Martin pilot for a series starring Roy Thinnes, as Hawaii-based government counter-intelligence agent, codename; Diamond Head. In this, his only adventure, Diamond Head has to prevent enemy agents from stealing a deadly nerve gas and its sale to foreign powers.