It was never a true ratings winner while in prime time on NBC. And, it was this day in 1969, after a three year run, the original Star Trek aired its last episode. Who could have known what a cash cow the program would become in reruns - spawning a series of films and TV spinoffs. Click below to view the final scene of the original series, and that fateful final episode titled "The Turnabout Intruder."

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