Principal Benjamin "Benny" Krupp, better known as Old Mr. Krupp and Old Captain Underpants to differentiate him from his present counterpart, is a supporting character in Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers, the tenth installment of the Captain Underpants book series.
He is the thirty-year-older version of Benjamin Krupp. He is voiced by Len Forgione in the Sound-O-Rama Audiobooks.
History[]
He is only in the tenth book, when George and Harold learn that the yelling instructors are actually themselves in the future when Old Mr. Krupp shows up and orders the teachers to get the pupils into class. The older George and Harold explain that their commitment to pay more attention in class and begin behaving like adults is what prompted them to start acting very much like the teachers they were used to.
Immediately after their first vow is broken, George and Harold make a new one promising to always be true to who they are. The adult George and Harold vanish as a result, and it is unclear whether they may return in the future (but with altered personalities).
To prevent younger Mr. Krupp (dressed as Captain Underpants) from being killed by Slightly Younger Tiny Tippy, George and Harold transform Old Mr. Krupp into Old Captain Underpants to save younger Nasty Mr Krupp "dressed as Captain Underpants from being beaten up by Slightly Younger Tiny Tippy" As soon as George and Harold snap wounded nasty Mr Krupp into Captain Underpants for the last time, Old Captain Underpants with his younger self team up and fight Slightly Younger Tiny Tippy, together and win.
After Slightly Younger Tiny Tippy dies in another time line, Old Captain Underpants is ordered to gather his clothes and fly back into his office, get dressed, and wash his face with water, turning him back into his nasty old self again.
