U-Ndokai was a Daimon supervised by Mimete who attacked Shun Hayase for his Pure Heart Crystal. She attempted to attack Sailor Moon and Sailor Chibi Moon by running with a gigantic ball, and was able to run so fast that she left flames in her wake.
- U-Ndokai was one of the rare monsters-of-the-day to show concern towards a human being, as she stopped to ask Hotaru about her health.
- She was the first Daimon to have been created from two objects instead of one.
- Her name is a pun for "undokai" (運動会; athletic meet).
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