Based on It Came from Beneath the Sink!, book #30 of the original Goosebumps series.
Kat finds a sponge-like creature with the power to cause bad luck.
The episode provides examples of:
- Spared by the Adaptation: The Grool is killed by being nice to it in the book, but in the episode it only subdues the monster and Kat has to keep it around and force it to listen to happy music to keep it calm.
