Don Marshall played Lieutenant Boma, the astrophysicist who openly challenges Spock's command of the stranded shuttlecraft, in the first-season episode The Galileo Seven.
Don Marshall (1936–2016) is best known as Dan Erickson in the series Land of the Giants. Shortly before that he guest-starred in The Galileo Seven.
Boma is one of seven aboard the shuttlecraft Galileo when it is forced down on Taurus II during a study of the Murasaki 312 phenomenon. As crewmen are killed by the planet's giant inhabitants, he becomes the sharpest critic of Spock's coldly logical decisions, insisting on proper burials for the dead and all but accusing the Vulcan of having no feelings.
The role was unusual for American television of 1967 in showing a black officer confronting his superior on equal terms, with the script taking no notice of his race.