The Enterprise transports the Medusan Ambassador Kollos; his telepathic interpreter, Dr Miranda Jones; and Engineer Laurence Marvick. Only Vulcans and those trained in Vulcan self-control can handle the horrible sight of a Medusan (and then only with eye protection). Attempting to kill Kollos, Marvick (jealous of Miranda's interest in Kollos) goes insane at the sight of the Mudasan ambassador. Before dying Marvick, one of the designers of the Enterprise, takes the ship outside the galaxy where it is hopelessly lost. Once it is discovered that Miranda is blind (she had fooled them with a complicated neural sensor in her dress) and cannot guide the Enterprise, Spock mind-melds with the navigationally proficient ambassador who quickly gets the Enterprise back in known galactic space. However, while severing the mind-meld, he forgets the visor, sees Kollos, and goes insane. Because of her jealousy of Spock's relationship with Kollos, Miranda hesitates to give help, but with Kirk's urging ... Written by
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In the very last scene, Spock places the visor over his eyes to protect himself from the Ambassador when initiating transport. Kirk should have vacated the room, however he is still in the room thus risking himself to insanity (as shown by him walking out after the transport is complete). See more
Captain James T. Kirk
Captain's log, stardate 5630.7. We have been assigned to convey the Medusans' ambassador to the Federation back to their home planet. While the thoughts of the Medusans are the most sublime in the galaxy, their physical appearance is exactly the opposite. They have evolved into a race of beings who are formless, so utterly hideous that the sight of a Medusan brings total madness to any human who sees one.