Royce Mumphry, better known as Cave Guy, is a large blue caveman who is surprisingly well-educated, erudite, has upperclass diction & taste & a stereotypical WASP tone. His origin is never described. He is a wanted criminal in five states. When he wants to lie low after a crime, he goes to the Hamptons. He is extremely disturbed by nerds, particularly those who speak Klingon. He goes to the Washington Gardens (also the Lobe's favorite restaurant), but only after special robberies.