Kara

Kara was the leader of the Eymorgs on the planet Sigma Draconis VI. She was responsible for stealing the brain of Commander Spock in 2268. She and her people although living in a technological society do not understand it, and are controlled by a central control system that enables them to perform tasks associated with their advanced society. "The Great Teacher" however was losing power, and Kara connected Spock's brain up to it to supply power to the central control system. McCoy was able to reverse the procedure and restore the brain back to Spock.