Captain Underpants 04 : Captain Underpants and the perilous plot of Professor Poopypants

No one takes Professor Pippy P. Poopypants seriously because of his name, even though he's invented some brilliant machines, and even though everyone in his country has a silly name. When he comes to Jerome Horwitz Elementary School to teach science, all the students make fun of his name, too, and he goes off the deep end. Only Captain Underpants can save the school and the world from the mad professor, his giant robot, and the Name Change-O-Chart 2000.