Benjamin Krupp



Mr. Krupp is the principal of Jerome Horwitz Elementary School. In The Adventures of Captain Underpants,George and Harold hypnotize him with the 3-D Hypno-Ring to

 make him believe he is Captain underpants. When he gets water on his face or head, Captain Underpants turns back into Mr. Krupp. When you snap your fingers around Mr. Krupp, he turns back into Captain Underpants.