Nightmare Moon is a major antagonist of My Little Pony: Friendship is Magic, serving as the main antagonist of the series premiere, "Friendship is Magic", a supporting antagonist of the Season 5 finale "The Cutie Re-Mark" and a posthumous antagonist for the rest of the series.

She was the corrupted form of Princess Luna, the younger sister of Princess Celestia who was consumed by her jealousy toward her older sister. As Nightmare Moon, she acted as Celestia's archenemy until she was restored to her normal form by the Mane Six.

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