Mistress 9 is one of the major villains of Sailor Moon S. She is also known as the Sovereign of Silence. She controls the Bureau of Bad Behavior, including Doctor Tomoe, and is second only to Pharaoh 90.
After Doctor Tomoe became possessed by Germatoid, he chose his daughter Hotaru as the host for Mistress 9, and she possessed her.
Her first appearance was in Episode 22, The Purity Chalice, though she is never referred to as Mistress 9 until she awakens.
She would often take control of Hotaru. After the death of Eugeal, and Sailor Moon got the Purity Chalice, Mistress 9 commanded the Heart Snatchers...
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