Mark Lenard portrayed both the Romulan commander and Spock’s father, Sarek, in the original Star Trek series.
Lenard first appeared in “Balance of Terror,” a 1966 episode that introduced the Romulans as a major threat to the Federation. His unnamed Romulan Commander is a disciplined military leader whose duel with Captain Kirk becomes one of the series’ most respected stories.
The following year, Lenard played Sarek in “Journey to Babel.” Sarek is Spock’s Vulcan father and the ambassador of Vulcan. The casting created a memorable contrast: the same actor who had played Star Trek’s first prominent Romulan also became one of its defining Vulcan characters.
Lenard later reprised Sarek in several Star Trek films and in Star Trek: The Next Generation. He also played a Klingon captain in Star Trek: The Motion Picture, making him the first actor to portray a Romulan, Vulcan, and Klingon in the franchise. George Takei, James Doohan, and Leonard Nimoy did not play both roles.