Kirk, Spock and McCoy suddenly find themselves in an underground laboratory where they meet an attractive young woman who is not only mute but also an empath who can absorb someone else's pain. When their captors make themselves known, they refuse to explain why the three men have been taken prisoner or why they and the young woman, whom McCoy has named Gem, are there. Inexplicably, they set about torturing them for no apparent reason. Fortunately, Gem's empathic powers allow her to take away their pain, but only at great sacrifice to herself. When their captors tell Kirk that he must choose which of his men to die, their selflessness comes to the fore, leaving Dr. McCoy volunteering himself. They all soon learn that the object of the experiment is Gem herself.
Did You Know?
Sound effects of the Vians' laboratory were previously used in the android Norman's lab in "I, Mudd". See more
When Kirk is being tortured, the wide shot from behind shows his arms outstretched almost sideways in the manacles, but when the shot changes to the front, his arms are bent at the elbow, and his wrists extend upward out of the frame. See more
Captain James T. Kirk
If my death is to have any meaning, at least tell me what I'm dying for.
If you live, you will have your answer.