You are entering another dimension, a land not of sight or sound, but of mind and magic. It is a realm where light hides amongst the shadows, and your enemies wear the faces of your friends. This is a dimension we call … The Gray Zone.

Submitted for your consideration: Canterlot, the capital of Equestria, the gleaming city on the mountain. Just yesterday, the city was host to a lavish Royal Wedding—and it fought off an invasion of shapeshifting insects. Today, the ponies fancy themselves safe. But as they will soon discover, their worst enemy still walks among them, unseen. The real nightmare has only begun …

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My tribute to a classic episode of The Twilight Zone.

Many thanks to my pre-readers:
JapaneseTeeth
KuroiTsubasaTenshi
Yami Vizzini

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Review and such.