Stardate 5630.7: Ambassador Kollos is brought aboard, a non-corporeal Medusan whose mere sight will drive any human insane. He is accompanied by Miranda Jones, who was trained on Vulcan and who can telepathically communicate with Kollos, and the engineer Larry Marvick, who is in love with Miranda. The jealous Marvick attempts to kill Kollos, but the mere sight of the Medusan drives him mad. He takes control of engineering, steers the ship into an uncharted region beyond the rim of the galaxy and eventually dies of the damage to his brain. Only the Medusan with his skills in the field of navigation could find a way back, and Kirk decides that Spock should link with Kollos, against Miranda's wishes. After returning the ship to known space Kollos, in Spock's body, forgets to put on the protective glasses again, upon which Spock's mind suffers heavy damage. He is healed when Miranda telepathically links with him.

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