Mistress 9

While she is doing this, Mistress 9 is able to leave Hotaru's body, ripping it apart in the process. Her true form is of a gigantic monster with ghoulish head and an indistinct body. She absorbs all of the Senshi's attacks and opens the door for Pharaoh 90, who begins to smother the planet. Mistress 9 is assimilated into the lava (which presumably is Pharaoh 90) and just when all seems lost, Sailor Saturn rises from it. When she sets her Glaive into the ground, both Pharaoh 90 and Mistress 9 experience intense pain and paralysis. Saturn uses the attack Death Reborn Revolution to drain their power and they both rise into the sky to escape back to Tau.

Saturn follows them and commands Sailor Pluto to seal the door forever. Pluto does this and assures that Mistress 9 and Pharaoh 90 can never reach Earth again. Interestingly enough, they are the only villains in the Sailor Moon manga to not only evade death, but essentially remain unharmed. In the anime, Professor Tomoe allows Mistress 9 to possess Hotaru's body after a freak accident kills her. He himself becomes possessed by a Daimon named Germatoid, although it is unclear if Germatoid completely controls him or aspects of his original personality still exist. Mistress 9 occasionally controls Hotaru, sequences in which her eyes become blank and her hands sparkle with red energy.

Strangely enough, the victims of these occurrences are usually Daimons sent to collect heart crystals for her. Eventually, she steals Chibiusa's Heart Crystal, rendering Chibiusa close to death, she becomes Mistress 9 to the shock of Uranus and Neptune, who are expecting Sailor Saturn. She kills the underling Kaolinite, and sends Germatoid after the Senshi. She then attempts to use a large machine (similar to the one Tomoe created prior to possession) to guide Pharaoh 90 to Earth so that he may destroy it. Sailor Moon tries to stop her and Professor Tomoe, now freed from Germatoid, attempts to reach her, still seeing her as Hotaru. She attacks both of them but is injured by energy emanating from the machine.

Professor Tomoe takes her in his arms and Hotaru's spirit begins to respond. Mistress 9 attempts to subdue her once again but Hotaru's memories of both her father and of Chibiusa prove to be overpowering. The black star insignia on her forehead shatters, revealing the sign of Saturn beneath it. Mistress 9's body then vaporizes, leaving Saturn in its place. Whilst in the manga Mistress 9's human form seemed only to be Hotaru's body contorted due to the presence of the entity, the anime Mistress 9's form seems to be her genuine body, somewhat similar to Chibiusa's transformation into Black Lady.