Old Benjamin Krupp

"You know, it's hard to believe that you guys used to be the craziest kids in this school! Thank goodness you both started taking life seriously!"

- Old Mr. Krupp

Old Benjamin Krupp is the thirty year older version of Benjamin Krupp.He’s is voice by Len Forgione in the Sound-O-Rama Audiobooks.

Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers
When Old Mr. Krupp arrives and tells the teachers to get the students into class, George and Harold discover that the screaming teachers are themselves in the future. It is revealed by the adult George and Harold that the vow present-day George and Harold made on focusing more in class and start acting like adults is what caused them to become greatly similar to the teachers they were used to. Immediately, George and Harold make a new vow to undo their previous vow and promise to always be themselves. As a result of this, the adult George and Harold disappear and it is unknown if they still exist in the future (albeit with different personalities). George and Harold snap Nasty 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"