The World's Oldest Comic (Starring Ook and Gulk)

The World's Oldest Comic (Starring Ook and Gulk) is a worldless comic made by George Beard and Harold Hutchins to convince the Cavepeople to help them fight Supa-Mega Tippy Tinkletrousers. It appears in Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers.