Harold's mom. Harold's Little Sister The Police Chief and Officer McWiggly - They arrested George and Harold, mistaking them as their evil counterparts who robbed a bank. The following characters appear on pages 46-47: Tippy Tinkletrousers - The dastardly villain of the Piqua State Penitentiary. He also appears in the alternate universe with the other supervillains as a fireman. He also also appears in the end with his Robo-Trousers, where he freezes the Police Chief and Officer McWiggly and chases George and Harold and Crackers and Sulu. Dr. Diaper - A supervillain in the first Captain Underpants book, but as a police officer. The Turbo Toilet 2000 - A supervillain in the second and eleventh Captain Underpants books, but as a crossing guard. Zorx, Klax and Jennifer - 3 rude aliens in the third Captain Underpants book, but as firemen. The Robo-Boogers - 3 disgusting booger monsters (Carl, Trixie and Frankenbooger) in the 7th book, but Carl appears as a postman, and Trixie and Frankenbooger appeared as construction workers. Reception Reviews for the book were mostly positive, with Kidsreads.com praising the entry. See also Captain Underpants References External links Sketches and the book cover Dav pilkey's official website When Hamsters Attack! 2006 American novels Captain Underpants novels Novels about parallel universes Scholastic Corporation books