I've done two of these in the past, actors who were guest stars on both Star Trek: The Original Series and Bonanza. I never included the obvious such as Majel Barrett, Leonard Nimoy, etc., nor am I now. Nor am I doing their bios.
In season 11, Susan Howard played Laurie Nagel in "The Medal."
But in ST's "The Day of the Dove," Howard plays Mara, the first ever female Klingon on the show who spoke! Another interesting fact about the representation of the Klingons is that they have darker skin tones than all the previous Klingons on the show.