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The Terrifying Cavity WARS! (恐怖のムシ歯WARS!, Kyofu no Mushiba UŌZU!) is the 49th episode of Urusei Yatsura.


Ten gets a cavity and bites Ataru for teasing him, and all hell breaks loose in Class 2-4 as an alien cavity can go away by biting many people but is simultaneously transmitted to them.

Plot Overview



  • Among the boys bitten, two resemble Kōsuke Shirai and Hokuto who were both bitten by the same characters the same way in the manga.

Differences from the manga

The anime follows the manga fairly closely, but the ending sequence after Onsen-Mark begs Lum to stop is original to the anime.