The character was first seen in Star Trek V: The Final Frontier and introduced ... but I see it being a fairly easy task to make the actor look like the Klingon diplomat. Some hair dye and wigs ...
Season 3 of Star Trek: Strange New Worlds ... the one helping Spock try to make Klingon coffee, raktajino. Mitchell was also transformed into a Crimson Guard character during the storybook effect ...