The Midnight entity

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The Midnight entity was a lifeform living on the planet Midnight. It was one of the few beings that the Doctor had no knowledge of at all, which, given his expansive, encyclopaedic knowledge of the universe and everything in it across time, was a testament, possibly due to its obscurity, or its innovation to adapt. The creature was never given a name, nor did it display any form other than a shadow running across the landscape.