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#7: Star Trek: The Original Series, season 1, episode 5 “The Enemy Within”

Written by Richard Matheson, directed by Leo Penn.

Stardates 1672.1 through 1673.1 (December 2266)

“We all have our darker side. We need it. It’s half of what we are.” - Doctor Leonard “Bones” McCoy

While on a survey mission, the Enterprise’s transporters malfunction and split Captain Kirk into two different people - a “good” Kirk and an “evil” Kirk. With a doppelganger on the loose, and the good Kirk losing the will to command the ship, the rest of the away team remains stranded on a planet where the temperature is rapidly dropping.

Originally released: 6 October 1966

“The Enemy Within” on Memory Alpha

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