When Kirk, Spock and McCoy beam down to a supposed uninhabited planet to gather the mineral ryetalyn to fight a plague of Rigelian fever on-board the Enterprise, they find a fellow Earth-man called Flint and his extremely intelligent female ward Rayna with whom Kirk begins to fall in love. Flint then proceeds to trap them and the Enterprise on his planet. Written by
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Rayna's name is spelled correctly on her name tag but appears in the end credits as "Reena." See more
Captain's log, stardate 5843.7. The Enterprise is in the grip of a raging epidemic. Three crewmen have died and twenty-three others have been struck down by Rigelian fever. In order to combat the illness, Dr. McCoy needs large quantities of ryetalyn, which is the only known antidote for the fever. Our sensors have picked up sufficient quantities of pure ryetalyn on a small planet in the Omega system. We are beaming down to secure this urgently needed material.