The Blob

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The Blob Monster is the main villain in the Goosebumps book, The Blob That Ate Everyone.

History
It was an idea slime monster created by Zackie Beauchamp which came to life. The Blob Monster does everything Zackie writes in his story, including eating his best friend Adam Levin. It was defeated, when Zackie uses his mind powers to think the blob away.