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Two weeks from Friday, The Dark Knight Rises, the third installment of Christopher Nolan’s Batman series, will open in the United States. If this film does anywhere near the box office its predecessor, The Dark Knight, did, the three films will gross 2 billion dollars. Batman is big business.

In the credits of that movie, it will say “Batman created by Bob Kane.” Indeed, Kane appeared in the Michael Keaton/Jack Nicholson Batman film a generation ago. ┬áHis heirs will see some major coin this summer.

It’s nice to see a writer make so much dough for a character, right? The problem is, Bob Kane was not the only creator of Batman. It could be argued, in fact, that he wasn’t the more important of the two creators, as so much of the Batman backstory–the Bruce Wayne identity, the Batcave, most of the inventions, and the villains like The Joker and Catwoman–were the work of his silent partner, a man named Bill Finger, the Tesla to Kane’s Edison.