"The Enemy Within" airs
"The Enemy Within" is an episode of Star Trek: The Original Series, and was broadcast on 6 October 1966.
It is a first season episode #5, production #5, and was written by Richard Matheson and directed by Leo Penn.
Overview: A transporter mishap divides Captain Kirk into two versions of himself, one good and one evil, but neither is able to function separately for long.
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Watch "The Enemy Within"
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