3.01 Spock's Brain

A woman appears on the Enterprise, incapacitates the crew, and removes Mr. Spock's brain. Captain Kirk leads a landing party to Sigma Draconis VI where the crew finds the males and females of the planet to be totally separated, leaving us all to wonder "what do they want with Spock's brain?"

Spock's Brain
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TOS Season 3, Episode 1

Lee Cronin (Gene L. Coon)
Marc Daniels

First Aired Sep 20, 1968
Stardate 5431.4