This episode take Kirk, spook and McCoy to another world where a sune will explode and destroy the world. Kirk, spook and McCoy fell into a machine that took them back in time. Kirk in the 16th Century and spook and McCoy to the ice age. I do not understand the behavior of Mr. spook. He has mood swings, he falls in love, get violent. that's Kirk's job. anbd all that is going on a few hours before the Earth explode. All the action has taken place on the planet and not on the Enterprise. This is the next to the last epiosde of the original series.
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