Editing Death Busters (section)

===Mistress 9===
{{nihongo|'''Mistress 9'''|ミストレス9|Misutoresu Nain}} is a malevolent extraterrestrial entity who is Pharaoh 90's main partner, sent to oversee her master's arrival to Earth with Tomoe implanting her Daimon Egg in the comatose body of Hotaru. But Mistress 9 did not fully awaken despite Hotaru having seizures while in the presence of a Taioron Crystal fragment, though Mistress 9 slowly becomes more active when exposed to the light of the Legendary Silver Crystal. After the Witches 5 have all been killed, her influence overwhelmed Hotaru as she force-grows her vessel into a woman with long hair. Mistress 9 steals Chibiusa's soul and Legendary Silver Crystal while using the latter as a replacement power source when she conducts the ritual to summon Pharaoh 90 to Earth. As Pharaoh 90 begins to manifest, Mistress 9 attempts to rip herself out of Hotaru's body to assume her true form. But Mistress 9 is surprised to find that Hotaru's soul still exists and is inhibiting the entity from leaving her body, managing to thwart her by forcing her to be paralyzed on the ground, so Hotaru has enough time to restore the souls of the Inner Guardians and Chibiusa to their bodies. Mistress 9, who turned into her true Daimon form and broke free of Hotaru's force, attempts to steal Sailor Moon's Silver Crystal before Sailor Chibi Moon arrives, Sailor Moon and Chibi Moon assume their Super forms to overwhelm Mistress 9. But when Pharaoh 90 fully manifests, Mistress 9 allows herself to be assimilated into her master with Sailor Saturn's spirit possessing Hotaru by later manifesting from what remained of Mistress 9.

In the first anime's [[Sailor Moon S|third season]], Mistress 9 (commonly mistaken for Sailor Saturn herself) makes her presence known early as she occasionally controls Hotaru to communicate with the other Death Busters, making Hotaru's eyes glow red and emit a red aura of pure evil, in contest to Sailor Saturn's light purplish one. But Mistress 9 fully awakens once obtaining Chibiusa's Pure Heart Crystal, killing Kaolinite for serving her purpose in her full revival. Mistress 9 attempts to use a large machine to guide Pharaoh 90 to Earth so that he may destroy it. Sailor Moon tries to stop her and Tomoe, now freed from Germatoid, attempts to reach her, still seeing her as Hotaru, and the vessel of Sailor Saturn; a fellow Sailor Guardian. She attacks both of them but is seriously injured by energy emanating from the machine. Professor Tomoe takes her in his arms and Hotaru's consciousness 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. It results in Hotaru awakening by merging with the spirit of Sailor Saturn within her, their combined strength destroying Mistress 9's dark essence for good.

In ''Sailor Moon S'', Mistress 9's voice is provided by [[Yuko Minaguchi]] and [[Yukiyo Fujii]] provides her voice in ''Crystal''. In the CWI English dub, she is voiced by [[Susan Aceron]]. In the Viz Media English dub, she is voiced by [[Christine Marie Cabanos]]. In the musicals, two actresses have played her: Tomoko Inami and Chinatsu Akiyama.