Stardate: 5431.4 --A woman from a strange alien ship transports to the Enterprise.She stuns everyone on the bridge with a device on her forearm and takes an interest in Spock.

When Kirk and McCoy wake up, they discover that that the woman has taken Spock's brain! They rig up something to keep his body alive but even a Vulcan can only survive a limited time without a brain, so they must track down the woman's ship and recover the missing organ.

original airdate--September 20, 1968  Remastered date--June 9, 2007

music:Theme song  written by Alexander Courage

Goof--The "star date" starts on 5431.4 but in mid-show the date is inexplicably given as 4351.5.

• When making his log entry, Sulu commits a breach of military etiquette by referring to Mr. Spock simply as "Spock", without any sort of honorific, title, or rank.

Trivia--In his book, William Shatner referred to this episode as "one of the worst." Leonard Nimoy has stated that he was embarrassed during the entire shooting of this episode.

Space: the final frontier. These are the voyages of the starship Enterprise. Its five-year mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no man has gone before.

Klinon

logh: Qav'e'. DaH 'entepray' Duj lengmey lutalu'. Qu' vagh qaStaHvIS DIS: Huj chu' qo', yISam yIn chu' tayqeq chu', vay' bolDly nuqDaq V pagh 'ej eQplore.