 In "" first-season episode "Errand of Mercy", Colicos had portrayed "Star Trek"s first main character Klingon.Rick Pasqualone appeared as Toral, son of Duras, in "The Sword of Kahless".Originally, the character, played by JD Cullum, was introduced in the "TNG" two-part episode "", when he sought the leadership of the Klingon High Council alongside his aunts Lursa and B'Etor.