Episode Title: "THE CHANGELING"
Production Number: 37
Original Air Date: 09-29-67
The U.S.S. Enterprise arrives at the Malurian system after losing contact with Dr. Manway's Federation Science team, but finds no life readings in the system where more than four billion Malurians lived. There is no sign of a natural catastrophe or a war.
The Enterprise is attacked by powerful ultrawarp weapons from an unknown attacker, which the crew learns is the Earth space probe Nomad, launched in the early Twenty-first Century. The probe was damaged in a meteor impact and later encountered an alien probe.
Nomad believes Captain Kirk is its creator, Jackson Roykirk, and stops its attempts to sterilize the U.S.S. Enterprise. Once beamed aboard the ship, Nomad enters the Bridge and erases Lt. Uhura's mind in order to learn her knowledge of music, and Uhura must be re-educated.
Commander Spock uses the Vulcan mind probe to access Nomad's memories, and learns that the Nomad probe, whose mission was to seek out new life, collided with a powerful alien probe called Tonru, whose mission was to sterilize soil samples from other planets. The two probes combined their programming, and the combined device now seeks to sterilize imperfect life forms, such as the entire Malurian race.
Captain Kirk points out that Nomad is imperfect, since it has mistaken Kirk for its creator, and convinces the probe to follow its programming and destroy itself.
Factoid: The Cymbeline blood burn takes more than a week to kill a population.
Factoid: The U.S.S. Enterprise is from the United Federation of Planets.
Factoid: The Malurian system had four populated planets.
Dr. McCoy: "He's dead, Jim."
Guest Characters: Lt. Kyle, Lt. Leslie, Nurse Christine Chapel, *[Jackson Roykirk]
KEY: [brackets]=illusions *star=first appearance