Vaughn Armstrong

• Klingon characters:
  Commander Korris (in The Next Generation)
  Korath (in Voyager)
  An unnamed Klingon Captain (Enterprise, Sleeping Dogs)
  
• Other Star Trek roles:
  Altogether 11 different, eg. Admiral Maxwell Forrest (ENT), a Kreetassan captain (ENT, Vox Sola), an Alpha Hirogen (VOY, Flesh and Blood), a Vidian captain (VOY, Fury), Gul Danar (DS9), Seskal (DS9, When it rains...) and many more
• See IMDB entry for more details.