When the students of Classroom 13 were struck by lightning, the Classroom laughed out loud. (Of course, no one heard the Classroom over the thunder outside.)

But when the students turned out to be okay and not hurt at all—and, in fact, had been given superpowers—the 13th Classroom was more furious than ever. It had always wanted to be a superhero. Why didn’t it get superpowers, too?! This was so unfair!

The 13th Classroom vowed revenge for the fourth time. Then the Classroom remembered that Halloween was coming up, which inspired a terrible, horrible, nasty idea.…