Mistress Nine Reveals Her Secrets

Mistress Nine tries to trick Sailor Moon into using the Holy Grail by pretending to be Hotaru. When Sailor Moon sees through her deception, Mistress Nine introduces herself and explains that she is a life form from another dimension, the Tau Nebula. Mistress Nine then laughs as a star appears on her forehead.
Key Cel (A1 End)
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Sailor Moon S Episode #124
Fear of approaching darkness! Struggle of the eight senshi
Semari kuru Yami no Kyoufu! Kusen no 8 Senshi