Star Trek Anniversary John's Top #20: : "Let That Be Your Last Battlefield" (#16)
"Let that Be Your Last Battlefield," far from being obvious or simplistic, is a masterful exploration of the utter irrationality of racism. It also, through the character of Spock, proposes a way through and past bigotry. His lesson of Vulcan, is a great description of a philosophy that brought a people into enlightenment.
This episode points to an optimistic future in which man leaves ignorance behind, to embrace a multi-cultural universe.