Name: Mistress 9 
During an explosion that occurred earlier in Professor Tomoe's Laboratory(see Hotaru's Past for more details), evil entity called Mistress 09 from the 'Death Busters' (the villains from the Super series) secretly possessed Hotaru's body without knowing she was actually reborn from the senshi of the star of destruction- Sailor Saturn. The change in dimension led Mistress 09 to become weak, and so she remain dormant inside Hotaru’s body.
Mistress 09 is the Death Buster's Messiah of Silence who is said would have complete strong powers if she got hold of the Sacred Cup- The Holy Grail (the three talisman combined together). With this power, the Death Busters would be able to complete their mission on Earth: to get enough power to release Master Pharaoh 90, by helping him open a gateway large enough for him to get through, bringing the Earth down to ruins.
Hotaru, being possessed by Mistress 09 led her to have no friends at school and made her have to suffer a lot. This was from the regular seizure, when Mistress 09 took control over Hotaru's body; even Hotaru herself would not know what was happening. Only after her consciousness, she was left to face the results. Mistress 09's regular take over caused a great deal of damage, hurting both the daimons from the Death Busters, and people around Hotaru.
Note:
In the Super Series, we do not know Mistress 09's existence until she finally awakens in episode 125. Before that episode,the Outer Senshi had always believed that Hotaru was the Senshi of Destruction, and had the spirit sleeping inside of her. Hotaru’s dangerous existence made them desperate to destroy her. However, the surprise came when she swallowed Chibiusa’s Pure Heart Crystal and she transformed into Mistress 09, instead of Sailor Saturn. They came to realise that Hotaru had turned into the Death Buster’s Silence Messiah- Mistress 09.
Storyline from Anime
Mistress 09 sensed that the Sacred Cup was approaching. "They're making it easy by bringing it to us!" Mistress 09 frowned, "But I can't allow them into our nest, until we establish ourselves."
End of Storyline- the battle of the Death Busters begins!
As Mistress 09 took control of her body, the Outer Senshi were desperate to destroy her, even though it meant sacrificing Hotaru. During the battle,it was evident that Hotaru was still alive in Mistress 09's body and at times took control of her, leading Mistress 09 to go insane. Mistress 09 used this at her advantage and pretended to be Hotaru and lured Sailormoon in giving in the Holy Grail to her. At last, Mistress 09 having control of the Holy Grail got the power she desired, and even Sailormoon's 'Moon Cosmic Power' could not stop Pharaoh 90 from approaching Earth, and the Holy Grail broke into million pieces. Eventually, Hotaru was able to regain control of her mind because of how much Chibiusa and her father meant to her. The Sailor Saturn symbol appeared and destroyed the Death Buster's Black star symbol on Mistress 09's forehead, and Mistress 09 was destroyed.
Mistress 09 images
In episode 125, after Kaolinite caught Chibiusa, an evil spirit reached out of Hotaru and into Chibiusa, stealing
her Pure Heart Crystal and swallowed it. After this, she was finally strong enough to regain her powers to reawaken and she kills Kaolinite who actually caught Chibiusa; showing her there was no use for her anymore. This was the beginning to the last battle with the Death Busters.
Professor Tomoe and Mistress Nine stood in the Death Busters hideout beneath Mugen Academy. Before them a giant dome-shaped machine appeared to be full of galaxies. Tomoe said that once they placed the Sacred Cup (The Holy Grail) into the machine, Tausaikei rays would guide their great master, Pharaoh 90 into this world. Tomoe said the world would be destroyed and covered in Silence.
"The Light age will end and the age of Darkness will begin!"
Mistress 09 created a force-field of dark energy around the half-destroyed Mugen building.
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