It Came from Beneath the Sink

Katrina Merton, and her brother, Daniel, have had a large bout of good luck lately, as they've just moved into a large new house that is in their school district and is close to all of their old friends. However, all that luck changes when Katrina finds a sponge that appears to have teeth and eyes beneath the kitchen sink. Suddenly, bad thing happen to Katrina everywhere she goes, and upon research, they find that the creature is called a Grool, a living sponge destined to bring bad luck, so Katrina decides to give it to someone else. However, upon further research, Katrina and Daniel find that whoever finds a Grool and gives it away, will die...