When Professor Pippy P. Poopypants comes to Jerome Horwitz Elementary School to teach science, and he goes off the deep end because students make fun of his name, only Captain Underpants can save the school from the professor's perilous plot.
First color edition.
New York, NY : Scholastic Inc., 
149 pages : colour illustrations ; 22 cm.
Captain Underpants. 4, Captain Underpants and the perilous plot of Professor Poopypants
Captain Underpants. 4, Perilous plot of Professor Poopypants
Perilous plot of Professor Poopypants
Captain Underpants ; 4
Subjects:Captain Underpants (Fictitious character) -- Juvenile fiction.
School principals -- Juvenile fiction.
Schools -- Juvenile fiction.
Superheroes -- Juvenile fiction.
Other Authors:Garibaldi, Jose, colourist.