3 stars, rated PG-13 (123 minutes) Unlike most of its superheroes, Marvel works within well-established systems to accomplish its goals — in this case, the corporate refineries of Hollywood and its theatrical and home-video pipelines. The Avengers may be wrecking cities in order to save humanity, but Disney-owned Marvel is more interested in polishing existing ideas and watching the money pour in. However, that shouldn’t discount Marvel’s risk-taking, calculated though it may be. “Captain Marvel” is the latest link in the Marvel Cinematic Universe’s decade-long, 21-film-and-counting chain of comic book adaptations.