Spock's Brain (TOS episode)
Encyclopedia
"Spock's Brain" is the first episode of the third season of Star Trek: The Original Series
Star Trek: The Original Series
Star Trek is an American science fiction television series created by Gene Roddenberry, produced by Desilu Productions . Star Trek was telecast on NBC from September 8, 1966, through June 3, 1969...

, first broadcast September 20, 1968. It was the first episode to air after NBC moved the show from 8:30 P.M. to 10 P.M. on Friday nights
Friday night death slot
The Friday night death slot is a perceived graveyard slot in American television, referring to the concept that a television program in the United States scheduled on Friday evenings is destined for imminent cancellation....

. It was repeated July 8, 1969. It is episode #56, production #61, written by Gene L. Coon
Gene L. Coon
Gene L. Coon was an American screenwriter and television producer. He is best remembered for his work on the original Star Trek series.-Life and career:...

 (under the pseudonym Lee Cronin) and directed by Marc Daniels
Marc Daniels
Marc Daniels , born Danny Marcus, was an American television director.-Life and Career:After serving in World War II, Daniels was hired by CBS to direct its first dramatic anthology program, Ford Theater. He mastered live television directing, and was hired to direct the first 38 episodes of I...

.

Overview: An alien female beams aboard the ship and, after incapacitating the rest of the crew, surgically removes Spock's brain. Kirk and the crew have just hours to locate and replace it before Spock's body dies.

Plot

On stardate
Stardate
A stardate is a date in the fictional system of time measurement developed for Star Trek, commonly heard at the beginning of a voiceover log entry such as "Captain's log, stardate 41153.7...

 5431.4, the USS Enterprise
Starship Enterprise
The Enterprise or USS Enterprise is the name of several fictional starships, some of which are the focal point for various television series and films in the Star Trek franchise created by Gene Roddenberry. It is considered a name of legacy in the fleet...

, under the command of Captain James T. Kirk, encounters a curious ship of unusual design. Upon contact, the ship emits a transport beam and a mysterious woman appears to the Enterprise bridge. She stuns the entire crew using a bracelet-like device, then examines each of them, taking particular interest in Mr. Spock. She then somehow removes his brain and disappears. When the crew awakens, Dr. McCoy
Leonard McCoy
Leonard "Bones" McCoy is a character in the Star Trek media franchise. First portrayed by DeForest Kelley in the original Star Trek series, McCoy also appears in the animated Star Trek series, seven Star Trek movies, the pilot episode of Star Trek: The Next Generation, and in numerous books,...

 finds Spock lying on a bed in sickbay and discovers what has happened to him. Thankfully, owing to the unusual physiology of Vulcans
Vulcan (Star Trek)
Vulcans, or sometimes Vulcanians, are an extraterrestrial humanoid species in the Star Trek universe who evolved on the planet Vulcan, and are noted for their attempt to live by reason and logic with no interference from emotion. They were the first extraterrestrial species in the Star Trek...

, Spock's body can survive in this "brainless" state mechanically, giving Captain Kirk about 24 hours to find his stolen brain.

Sensors detect the ship's ion trail and Kirk follows it to the Sigma Draconis
Sigma Draconis
Sigma Draconis is a 4.7 magnitude star located at a distance of 18.8 light-years in the constellation Draco. Its traditional name is Alsafi.-Name:...

 system. The system contains three planets that are reported to be inhabited: Sigma Draconis III, IV and VI, however the recorded technological levels of each world are determined to be incapable of producing the kind of spacecraft that the Enterprise followed here. The sixth planet however, which shows no sign of industrial advancement at all, radiates energy transmissions that Lt. Uhura
Uhura
Nyota Uhura is a character in Star Trek: The Original Series, Star Trek: The Animated Series, the first six Star Trek films, and the 2009 film Star Trek...

states as contradictory to its technological scale. Playing on the hunch that the planet may be deceiving, Kirk beams a landing party to the surface.
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