Clarence J. `` Clancy '' Brown III ( born 5 January 1959 ) is an American actor and voice actor known for his roles as Byron Hadley in the award winning The Shawshank Redemption and Career Sergeant Zim in Starship Troopers . He is perhaps best known for his role as the Kurgan in the cult classic Highlander . Clarence J. `` Clancy '' Brown III ( born January 5 , 1959 ) is an American actor and voice actor known for his roles as Byron Hadley in the award winning The Shawshank Redemption , Brother Justin Crowe in HBO 's critically acclaimed Carnivale , Career Sergeant Zim in Starship Troopers as well as for his role as the Kurgan in the cult classic Highlander .