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My Teacher Is an Alien(My Teacher is an Alien 1)

by Bruce Coville
Susan Simmons knows that her substitute teacher is really weird. But she doesnt know how weird until she catches him peeling off his face--and she realizes that Mr. Smith is an alien! Only Peter Thompson, the class brain, believes her, and when the two discover Mr. Smiths plans for their classmates, only they can save the rest of the sixth grade from a fate worse than