Dav Pilkey <br/><br/>
Captain Underpants And The Preposterous Plight Of The Purple Potty People 

<br/><br/> Harold and George's time-traveling Purple Potty lands them in an alternate universe where everything seems delightful, but evil lurks just beneath the surface, and leads to a battle between Captain Underpants and his own evil twin. 
<br/><br/><label>ISBN: </label>9789811107054 
<br/><br/><label>Dewey Class. No.: </label>English PIL