Have George and Harold completely lost their minds?

Potty has landed them in a crazy place where the teachers are always nice, the cafeteria serves delicious food, and the school principal, Mr. Krupp, actually thinks they're funny. Something is very, very wrong—and it gets even WRONGER when the boys' pet pterodactyl, Crackers, and Sulu the Bionic Hamster are kidnapped by George and Harold's evil-twin look-alikes. Now George and Harold must face their cleverest enemies yet: THEMSELVES! Could this be another job for the amazing Captain Underpants?