Just when George and Harold thought they were safe, a terrifying face from their past makes a massive comeback. The wicked Professor Poopypants has returned to town, and this time he is calling himself Tippy Tinkletrousers. Armed with a giant, stomping robotic suit, this furious villain is determined to get his revenge on everyone who ever laughed at him. You will blast into another epic comic adventure as the boys desperately try to stop Tippy before he flattens the entire school. Grab your cape and get ready to laugh out loud at the wildest jokes, craziest battles, and silliest escapes you have ever seen. It is up to George, Harold, and the amazing Captain Underpants to end this robotic reign of terror before time runs out.