A little money can go a long way, which is proved by "The Empath," an episode made on an obvious shoestring budget, but having the style and story strength to pull off something quite moving. Kirk, Spock, and McCoy beam down to a research outpost, but soon find themselves the captives of alien experimenters (Willard Sage and Alan Bergmann) who had killed the missing research scientists. Also captive is a mute alien woman whom Bones names "Gem" (Kathryn Hays), and who possesses the ability to cure another's injuries by absorbing them into herself.
The episode becomes a classic Trekkian test of human qualities when it's revealed that the landing party has been made captive (and is to be subjected to life-threatening injuries) as a way of testing Gem's ability of self-sacrifice. Kirk, Spock, and McCoy each show a selflessness that is respectable, and the two aliens hope Gem will, also.
The money-saving all-black staging and minimized props actually enhance the eerieness of the situation. And without saying a single word, Kathryn Hays brings a powerful empathy to Gem through skillfully exaggerated gestures and facial expressions—an approach that brings a great deal of poignancy to the material. It's a refreshing hour of nice ideas.