Interestingly, Mark Lenard has played as Romulan, Vulcan, and Klingon over the years. I believe the only actor to do so.
Never noticed his Klingon persona before. That looks like one of those Klingons from one of the movies...
Nice catch! He looks a lot like Martin Landau in the middle pic tho. (I loved Space:1999 way back when. And let's not forget his work in the real/TV version of Mission:Impossible)
I forget the episode, but Mark Lenard shows up as the villain in a fairly early episode of M:I. Actually, a *lot* of TOS actors including George Takei show up on M:I. There's actually one episode of M:I where Ricardo Montalbán plays the villain; the mission brief in the teaser includes the same picture of him that is used in the Briefing Room scene of "Space Seed".
Yes, he played a Klingon captain in the first movie after the part of Sarek was deleted from the film.