This boy thinks that he is dumb but he isn't. J.D. is the younger brother of the Great Brain (Tom) but J.D. is actually quite smart. He tries to catch one of the worst criminals in Utah and he succeeds. J.D. also becomes a big brother when there's a rockslide and the Pennyworth family was killed except for a little boy named Frankie. At first, Frankie acted crazy but then J.D. smacked Frankie on his behind and Frankie acted better.
