J G Hertzler has played many roles on Star Trek, but is best known for his portrayal of General Martok on Deep Space Nine, and for writing two books about the character.
Here's what he told us about Klingons and more.
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Klingon jock
What's the secret to playing a Klingon successfully?
You'll go spar
Did you enjoy all that on-screen fighting?
Big appeal
What do you put your cult tv popularity down to?
No room for Klingons
Do you think Klingons still hold the same place in Star Trek?
Writing Martok
Tell us about how you came to write two books about your character?
tlhIngan Hol DajatlhlaH 'e' DaneH'a'?
Can you still speak any Klingon?
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