Which actor portrayed both a Klingon and a Vulcan in the "Star Trek" films?

Mark Lenard was the first Klingon Captain seen on the big screen in "Star Trek the Motion Picture" (1979), and is best known for playing Spock's father, Ambassador Sarek, a full Vulcan.

In 1924, Lenard was born under the name "Leonard Rosenson" in Chicago Illinois. His father was Abraham Rosenson, a Russian-Jewish immigrant who eventually owned his own tourist resort in South Haven, Michigan. Lenard was primarily raised in South Haven. He joined the United States Army in 1943, at the age of 19. He was originally trained as a paratrooper, but was eventually given the position of a technical sergeant. He was discharged in 1946, without ever seeing combat.

Possibly due to his experience in Star Trek, Lenard was often cast as an authority figure in science fiction television series. He played General Urko in "Planet of the Apes", Emperor Thorval in "The Secret Empire", Ambassador Duvoe in "Buck Rogers in the 25th Century", and camp commandant Perel Sightings in "Otherworld".

Lenard died in 1996, suffering from multiple myeloma, a cancer of the plasma cells. He was 72-years-old, and had been appearing on film and television for three decades.

Christopher Lloyd portrayed Commander Kruge in "Star Trek III The Search For Spock" (1984).

Christopher Plummer played General Chang and David Warner played Chancellor Gorkon in "Star Trek VI - The Undiscovered Country" (1991).