"There is only one logical answer — we have an imposter aboard.” When a transporter malfunction splits Captain Kirk into two versions of the same person — one gentle and compassionate, the other mean and fierce — the result is a magnificent “Star Trek” episode that’s loaded with tension, high drama, brilliant performances, provocative themes and one very controversial scene. But by further establishing the dynamic relationship between Kirk, Spock and McCoy, “The Enemy Within” achieves landmark status as an all-time classic.

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