Kip. 1: Premonition of World's End? The Appearance of Mysterious New Warriors!

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After Rei has a vision of the world being destroyed by some unknown threat, she is attacked by a youma that Sailor Moon is unable to beat. After the Senshi attacks have failed to beat their new enemies two unknown figures, Neptune and Uranus, emerge and defeat the youma. (Source: Sailor Moon Wikia)