Episode Information
About this episode
The Enemy Within is season 1, episode 4 of Star Trek: The Original Series, first aired on 6 October 1966.
In series order, the previous episode is S01E03 — Mudd's Women and the next is S01E05 — The Man Trap. By original air date, the previous episode is S01E06 — The Naked Time and the next is S01E03 — Mudd's Women.
Browse every episode in Season 1.
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