The Only Man To Be A Vulcan, Romulan, And Klingon
Actor Mark Lenard is best known for his role as Vulcan ambassador Sarek, Spock’s father. But before he gained notoriety as Sarek, Lenard first appeared on TOS as the first ever Romulan to appear in the series in the first season.
For Star Trek: The Motion Picture, Lenard portrayed a Klingon captain and as a result, Lenard officially became the only actor in the history of Star Trek to play three different alien species. Regardless, his most prominent role is Sarek, which he reprised in The Animated Series and three of the Star Trek films.
Wait until you find out why Trekkies hated William Shatner at one