George and Harold have played a trick or two on nearly everyone at Jerome Horwitz Elementary. When their latest prank causes the school’s cranky cafetería ladies to quit, Mr. Krupp hires a trio of umisual replacements — who happen to look an awful lot like aliens! Will that curtain-caped crusader, Captain Underpants, save the day once more? Or will those outerspace cafetería ladies have him for lunch?