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The first day of seventh grade was probably the worst day of Duncan Dougal's life.

After Susan sees Mr. Smith, the substitute teacher, peel off his face, she knows he is an alien and only Peter believes her; and together they work to save the class from Mr.

Peter Thompson chooses to return to space with the alien Broxholm who has been masquerading as a teacher in order to study humans, but he is alarmed to discover the rulers of the galaxy are debating how to solve the problem of violent, destructive, underachieving Earthlings.

Employing scientific methods learned in Mr. Sparks's class, fifth-grader Leon competes in a potato chip tasting contest and takes revenge against Lumpkin the bully.

When George and Harold hypnotize their principal into thinking that he is the superhero Captain Underpants, he leads them to the lair of the nefarious Dr.

Pleskit, a sixth-grade student from another planet, tries peanut butter, which makes him romantic.

Tom expects Pleskit to help him with his science fair project but this has unexpected results.