A transporter mishap swaps Captain Kirk and his companions with their evil counterparts in a parallel universe. In the so-called Mirror Universe, the Enterprise is a ship of the Terran Empire, an organization as evil as the United Federation of Planets is benevolent.
"Mirror, Mirror" is the fourth episode of the second season of the American science fiction television series Star Trek. Written by Jerome Bixby and directed by Marc Daniels, it was first broadcast on October 6, 1967.
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