In this classic Goosebumps tale by R. L. Stine, young Kat discovers a strange, living sponge under the kitchen sink in her new house. This grotesque creature seems to be a magnet for bad luck, causing chaos and misfortune for her family. Kat desperately tries to get rid of the monster, but it's seemingly indestructible and always returns, more menacing each time. She must uncover the secret to defeating this slimy pest before it consumes her and her family in a wave of perpetual bad luck and terror.