Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies from Outer Space (and the Subsequent Assault of the Equally Evil Lunchroom Zombie Nerds) is the third book of the Captain Underpants series by Dav Pilkey. The series of American children's books are about two fourth graders, George and Harold, and their mean principal Mr. Krupp, who can turn into Captain Underpants. It was published on September 1, 1999. It is the first book to feature the use of 'Extra-Strength Super Power Juice' (an invention of Zorx, Klax, and Jennifer, the antagonists of the book), which is used to give Captain Underpants superpowers later in the book. It has the longest title of all the books in the series, having 25 words. Its "annoyingly long title" becomes a running joke in the later books. In September 2008 a collector's edition of the book was released. It features a 3D cover, and a CD of Captain Underpants-themed songs by Dav Pilkey's friend Koji Matsumoto. Source: Wikipedia (en)