George and Harold are in a STICKY situation. Their latest prank has SNOTTY school brainiac Melvin Sneedly seeing red, and he can't wait to get them back. But when Melvin tries to transform himself into a bionic-powered superboy, things get a little gloppy -- and the Bionic Booger Boy is born! Can Captain Underpants beat this blobby behemoth of blech, or is the entire world doomed to drown in disgusting nose-dribble? Pass the tissues, please!
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