Movie Description Captain Kirk and crew journey back to the 1960's to observe Earth history when they cross paths with a mysterious alien agent who claims to be trying to save the planet. They have their doubts when it is clear he is trying to sabotage a nuclear missile launch. This episode was actually a pilot for a spin-off show which was never picked up and so was cycled into Star Trek's season as an episode. First aired March 29, 1968.
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