In Captain Underpants Revolting Revenge in the first book it was talking about this evil guy name Tippy Tinkletrousers. He wanted to destroy Captain Underpants so Tippy Thinkletrouser can rule the world. So he went back in time to change history 5 years in the past. And so Tippy got Captain Underpants fired for no reason. So there will be no Captain Underpants. George and Harold couldn’t hipnitzed him and he wasn’t there to save the world. So Tippy went back to the present and he realized what he did wrong the hold world was destroyed! Because he scared those bullys and Mr. krupp got blame. So Tippy said he must fix it but then. He get’s step on!!! Now who could save the world now….