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                   Star Trek: The Original Series: Vol. 11: Episodes 21 & 22: Tomorrow is Yesterday / The Return of the Archons (1966)
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In 'Tomorrow is Yesterday,' the USS Enterprise is accidentally sent back to 1960s Earth and must find a way to return to its own time without altering history. In 'The Return of the Archons,' the crew encounters a planet controlled by a powerful computer that enforces a mindless conformity on its inhabitants.
                 
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