The Oscar nominations were announced the other day. To no one’s surprise, the screenplay for The Avengers was not among them. That’s a shame, because the screenplay for The Avengers is a startling model of precision, density and propulsion. It manages to juggle no fewer than ten wildly disparate main characters in its ensemble cast and give each of them weight, clarity and purpose. Dear readers, I’ve worked on many a comic-book movie, none of which ever got near production. To get one superhero narrative to work is damn near impossible; The Avengers soars with seven.