that which survive be a good and low key and atmospheric third season episode that have a melancholy air to it and especially in retrospect after you learn what happen to losira and her people . i would definitely rank it a one of the good show of the last season and though admittedly the bar be pretty low . if there anything really odd about that which survive and it the dialogue . all of the character be really snappish with each other . sulu will say something and kirk will almost bite his head off . same thing go on back at the enterprise while spock be more of a smartass than we have ever see him before . almost anything anyone say to him be meet with a response drip in sarcasm . it quite a different approach and frankly it become annoy after a while and though some of his line be funny . i do not recall any other episode of st with dialogue quite like this . and it all the more peculiar a the writer and john meredyth lucas and be a trek veteran who write four show include the fine episode the changeling . none of his other script display this odd approach to dialogue . lee meriwether be a good choice for the mysterious and lonely losira and the scene on the planet be the most interesting .