The Enemy Within
Episode 6 of 30 within Season One. Item 6 of 90 overall.
Production number 005.
Richard Matheson - Writer
Leo Penn - Director
398 votes

Stardate:1672.1--A transporter malfunction separates Kirk into two people: a kind and gentle vacillitating version, and a strong-willed arrogant Kirk who gives in to his every bestial urge.

Elsewhere, when the divided Kirks start to die, Spock and Scotty must work to reverse the split and save him, as well as repair the transporter so they can beam up a stranded crew.

original airdate--October 06,1966   

network: NBC

music: "Theme from Star Trek" "Where No Man Has Gone Before" by Alexander Courage 


Alien Races: Alpha 177 quadrupeds 

Factoid: Spock is half-human, half-alien.

  • Dr. McCoy keeps bottles of Saurian brandy in Sick Bay.



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.

Klingon: logh: HeH Qav'e'. DaH 'entepray' Duj lengmey lutalu'. Qu' vagh-DIS: Huj chu' qo', yISam yIn tayqeq chu', vay' boldly nuqDaq V pagh 'ej explore.

related items

Previous episode :
005 The Naked Time
Next episode :
007 Mudd's Women

alternative title

Also known as - Klingon=rInpa' jagh

regional titles

The Enemy Within
The Enemy Within
Kirk : 2 = ?
The Enemy Within
Il duplicato
El propio enemigo