"Requiem for Methuselah" is the nineteenth episode of the third season of the American science fiction television series Star Trek. Written by Jerome Bixby and directed by Murray Golden, it was first broadcast on February 14, 1969. In the episode, the crew of the Enterprise encounters an immortal human. Its repeat broadcast, on September 2, 1969, was the last official telecast of the series to air on NBC. Star Trek would immediately appear in syndication on the following Monday, September 8, a full three years after its debut. Plot The crew of the Federation starship Enterprise is struck with deadly Rigellian fever, for which the only treatment is the mineral ryetalyn. Captain Kirk, first officer Spock and medical officer Dr. McCoy beam down to the planet Holberg 917-G in search of the substance and are attacked by an airborne robot, which is called off by its master, Flint. Flint demands they leave immediately, but Kirk orders the Enterprise to fire phasers on their coordinates if they are attacked. Acknowledging a stalemate, Flint agrees to let them remain long enough to obtain the ryetalyn. Flint offers the help of his sentry robot M4 to gather the mineral and escorts them to his home, which has an impressive art collection. Spock notices that the brushwork of the paintings is identical to Leonardo da Vinci's, but his tricorder indicates that they are made with contemporary materials. The party is introduced to Flint's young ward, Rayna Kapec, whose late parents, according to Flint, were employees of his. On Flint's suggestion, Kirk plays billiards with Rayna, and they dance to a waltz played on the piano by Spock. The sheet music, apparently in the hand of Johannes Brahms, is written with contemporary ink. M4 returns with a container of ryetalyn, but it is contaminated with irilium, and therefore useless. Flint apologizes and accompanies M4 on a search for more ryetalyn. When Kirk kisses Rayna, M4 reacts as if he were attacking her. Spock destroys it with his phaser. The Enterprise reports that no information can be found on Flint or Rayna. A tricorder scan reveals that Flint is over 6,000 years old. Rayna comes to say goodbye to Kirk, who has fallen in love with her and begs her to accompany him. McCoy tells them that after being processed in Flint's laboratory, the ryetalyn vanished. Spock follows tricorder readings to a laboratory chamber containing not