Star Trek

Season 1 Episode 5

The Enemy Within

11
Aired Unknown Oct 06, 1966 on NBC

Trivia

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  • Notes

    • This episode marked the first appearance of Kirk's alternate green uniform. It was introduced primarily to tell the "good" Kirk from the "evil" Kirk. However, the producers liked the idea of setting the captain apart with a different colored uniform so they used it frequently throughout the series.

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