Meteora Butterfly

Meteora Butterfly (voiced by Tress MacNeille) used to be known as Miss Heinous, is a recurring antagonist in the first two seasons and first half of the third season of Star vs. the Forces of Evil, and became the main antagonist of the second half of the third season. She was the headmistress of St. Olga's Reform School for Wayward Princesses and is the Mewman/monster hybrid daughter of Queen Eclipsa. Meteora was reverted to infancy by her mother in the third season finale.