A make or break film for the Marvel universe. If this crapped the bed at the box office, who knows what would have happened next. Thankfully, it's terrific. Big-name actors taking big swings. Alan Silvestri's heroic score. Special effects that match the moment. But does the film feel forgettable on the re-watch? PLUS: we look at the reasons why some may have been skeptical of this film initially - reasons that have been lost to time.