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George and Harold are in trouble. Their prank has not gone down well with school brainiac Melvin Sneedly. Soon, he is sure to get them back.
But when Melvin attempts to become a bionic-powered superboy, things don't go as planned. Instead, the Bionic Booger Boy is born!
Will Captain Underpants bear this gloopy blech? Read the book to find out.
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