Spock's Brain. Offen a contender with "The Way to Eden" as the worst episode of Classic Trek. I much perfer Spock's Brain for many reasons and the chief one being that Spock's Brain doesn't have hippies.
The Enterprise has encountered a unique alien vessel and before they can study it further, an alien woman transports aboard and disables the crew. Once awake, McCoy learns a horror that Spock's brain has been stolen and Spock is on emergency life support. Tracking the trail of the vessel, The Enterprise comes to a planet where they belive Spock's brain is and discover a strange primitive culture of men on the surface and a seemingly advanced culture of women underneath.
The antagonists need Spock's Brain to keep they're master computer running underneath the surface to keep they're society running. Kirk of course has to break it to them that it's wrong to take someone's brain. This episode is so silly that you half expect it to be played in preschools for kids.
Spock's Brain is killed on two counts. Seeing a unmarked plain button controller steering around Spock in a most undignified fashion and the line "BRAIN AND BRAIN, WHAT IS BRAIN?!" by the brainless miniskirted space babe. If I'm not mistaken she says it at least twice and you can taste the ham each time. For what it's worth, Spock's Brain is at least a little fun and has no hippies.
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