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
Did You Know?
This story's "macguffin" is a plague medicine called Ryetalyn, accent on the second syllable. In real life, Ritalin, accent on the first syllable, is a commercial name for the psychiatric drug Methylphenidate, used to treat attention deficit hyperactivity disorder. It is unknown whether the naming was a deliberate allusion. See more
The sheet music for Flint's Johannes Brahms
waltz, which we see in a close-up, does not correspond to the waltz Spock has played. 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.