But was it actually controversial or was it greeted with indifference? I suspect this might be another case of print the myth.
That would depend on who you were and where you lived, which is why I said "controversial".
Personally I think it's a bit overblown. Though civil rights and segregation were still an issue in 1968 as the February 8 entry in Gov. Kodos'
list shows. Was a show like Star Trek even a blip on the racist radar? Hard to say. But if say, Diahann Carroll had been cast as Elaan or as Helen Noel back in 1966, the blip might have been bigger.