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.