TOS: A Taste of Armageddon, streamed on Netflix.
Even this late into the first season, Spock still refers to himself as a 'Vulcanian'.
I always feel bad for Fox's assistant, who gets gunned down in one of the disruptor battles and left behind in a corner someplace. If the poor guy was still alive, Fox could have shown at least a little concern before running off to the radio room with Anan to stop the 500-year old war, a few more minutes wouldn't have mattered at that point.