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(1969) A transporter experiment results in duplicating Mr. Spock. One of the Spocks is eeeeevill ... but which one? Meanwhile, the Klingons have violated the Organian peace treaty and started a war on the Federation. It's not a great episode, but it is a curious visit to (what are now) the early days of the franchise, when much of the series' Bible hadn't been written yet and it shows. And for that it's fun.