Captain Shatner wrote:
Also, the Federation, for all its talk of equal rights of races, seems oddly dominated by humans. Consider the fact that Spock is the only non-Terran serving on the Enterprise!
Other Vulcans serving on the Enterprise
is mentioned in the episode "Journey to Babel".
Not to derail this conversation, but....
CHAPEL: I've checked the blood bank. There isn't enough Vulcan blood and plasma to even begin such an operation of this type.
KIRK: There are other Vulcans aboard.
SAREK: My blood type is T-negative. Somewhat rare, even for a Vulcan.
(I think that Kirk might simply be referring to the Ambassador and to his two Vulcan aides who accompanied him on board--not to some crewmembers.)
And now back to the topic....