You may have thought the space-western was dead after Joss Whedon's Serenity failed to make its money back at the box office but, hey! It's amazing what landing a hot star can do! Robert Downey Jr, fresh off the biggest hit of his career with Iron Man, has just signed up to star in Cowboys and Aliens. It's the film adaptation of a graphic novel that has apparently been kicking around Hollywood for about a decade but Downey's game, Downey's hot and so the film is a go. Plot? Well, there are cowboys. And aliens. And they fight. What else do you need?