Nightmare Moon is the main antagonist in the first and second seasons of The New Adventures of My Little Pony: Friendship is Magic  and one of the secondary antagonists in the third, fourth, fifth, and seventh seasons and one of the quaternary antagonists in the sixth season. She is also one of the two main antagonists in the seventh season. She was the alter ego of Princess Luna until she was forced out by the Mane Six. She wants revenge on Princess Celestia and Princess Luna. She serves as the main antagonist in the 5-part Nightmare Twilight & Spike Sparkle. She later took a liking to Twilight's Alicorn magic and Spike's Dragon magic, mostly Twilight's Alicorn magic and became interested and obssessed in corrupting Twilight and Spike and making Twilight her apprentice and Spike her messenger. She has a pet three-headed blue dragon named Shinomura Moon, who she treats like a child. Unlike her night guards, Shinomura Moon never failed her and thus was promoted to her number one assistant. She starts out as the main antagonist in Twilight Sparkle vs. Monster X, but then becomes the secondary protagonist to help Princess Twilight defeat the true main antagonist.
Nightmare Moon

You're going to need to help more than your sister when I get through with you Luna.

Nightmare Moon --But it is no less a fate...-- S5E26

Unless, of course, weak Princess is the role you've always wanted to play in this world.

Twilight walking with Nightmare Moon S5E26

I am surprised that somepony with your intellect does not see this 'friendship' is nothing but a new form of imprisonment. Clearly you've had to abandon your true nature to stay in their good graces.

Twilight --A pony from my time used this spell-- S5E26

Oh, please, I've seen this before. But she was always weak minded. You are Princess Twilight, you are legend, and your adoptive brother is the prince! You cannot fall into the same trap that claimed the Tantabus. Help me grow stronger and be rewarded with something greater than friendship. Freedom. Once I've brought eternal night, nothing would give me greater pleasure than to see their world in nighttime sparkle. Who better to do so than the Princess of Magic herself? You and your adoptive brother must join me, Twilight, and reclaim your greatness.

Luna Ghidorah

Shinomura Moon, Nightmare Moon's pet.


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