"Gotham," Fox's crowd-pleasing new police procedural/comic book mash-up, is a Batman origin story for viewers who don't much care about Batman. (Full disclosure: I'm one of them.) In contrast to Christopher Nolan's desolate "Dark Knight" trilogy, creator Bruno Heller's treatment of the DC Comics universe marshals a colorful cast of characters and more than a little levity to imagine Bruce Wayne's hometown as a garish funhouse rather than an apocalyptic hellscape, all of it sketched in the whiz-bang style of midcentury graphic art.