Monster's Cavity Hurts! is the thirteenth episode of Ultraman Taro.
While ZAT members conduct training sessions at the seaside of Miyazaki, a monster accidentally mistakes one of Kotaro’s underwater rockets for food and bites down on it. The monster, Sheltar, suffers from the pain due to the rocket lodged in its teeth, causing it to rage. Agonizing from the horrible pain, Sheltar begins to ravage a nearby city.
- Ultraman Taro Volume 3 features episodes 10-13.