Batman has many secrets — the best-known one, of course, being his millionaire alter ego, Bruce Wayne. But that may not be the Dark Knight's biggest secret.
Since the 1930s, only one man has been given credit for creating the caped crusader and his home city of Gotham. Bob Kane's name appears in the credits of all the movies, the campy TV show and the associated merchandise, from video games and action figures to sheets and underwear.
But what if Bob Kane didn't do it all by himself?