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Season 1 - Sep. 08, 1966
Season 2 - Sep. 15, 1967
Season 3 - Sep. 20, 1968
Star Trek Season 2 Episode 4
HD
Overview:
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.