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A.J.'s third-grade teacher, Mr. Granite, is retiring after a million hundred years. It turns out the new teacher, Mr. Cooper, is even weirder than Mr. Granite! One day he's Rat Man and he teaches about rodents. The next day he's Lava Man and he teaches about volcanoes. But what happens when a real superhero is needed? Will Mr. Cooper protect the school from evil, or just embarrass it to death?