13 terrifying Star Trek episodes worth beaming down for Halloween

Star Trek's often thought of as the lighter side of sci-fi—a future in which we manage not to destroy everything we hold dear—but it turns out that amid the Klingons and the Tribbles, even the Federation knows how to whip up a good scare.

For the 18th in our series of 31 posts for the 31 days of Halloween, here are 13 of the scariest episodes Trek has to offer for your viewing pleasure (and you might want to leave the lights on).

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