Pilkey, Dav <br/><br/>
Captain Underpants and the preposterous plight of the purple potty people 
/ the eighth epic novel by Dav Pilkey 
 - 172 pages :  illustrations 
 - Captain Underpants,  book 8 .
<br/><br/> When George and Harold use their traveling purple potty to travel to another dimension where the school is nice and the principal, Mr. Krupp, thinks they're funny, they meet up with their evil twins and must face their cleverest enemies ever -- themselves. 
<br/><br/><label>ISBN: </label>9780439951340 
<br/><br/><label>Subjects--Topical Terms: </label><br/>School principals--Juvenile fiction
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Graphic novels
<br/><br/><label>Dewey Class. No.: </label>Fic