John Colicos Biography
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Trivia

Played the first Klingon ever seen on Star Trek.

Among his closest friends was Lorne Greene, with whom he did a 1952 Canadian radio performance of Joseph Conrad's novel "Heart of Darkness."

Began his acting career in 1946 performing on stage in Canada and acted in hundreds of plays on three continents prior to acting in films and TV shows.

After Leonard Nimoy's Spock, his "Star Trek" (1966) and "Star Trek: Deep Space Nine" (1993) character, Kor, is the second longest running character to have been played by one actor in the "Star Trek" franchise. He made his first appearance as Kor in "Star Trek: Errand of Mercy (#1.26)" (1967) on March 23, 1967 and made his final appearance in the role in "Star Trek: Deep Space Nine: Once More Unto the Breach (#7.7)" (1998) on November 11, 1998, more than 31 years later. The latter was his final acting role before his death.
Source provided by imdb (Copyright) - The Internet Movie Database.