Marvel Comics was, until recently, the largest independent comic book publisher in the United States. And then they were bought by the Walt Disney Corporation.
Marvel is the home to several very popular comic book titles and characters, including:
and many others who haven't been turned into movies. Marvel has over 4,700 intellectual property characters, although many of them are characters like Crusher Hogan or The Slug, who nobody knows about, unless they're people like Psycho Andy who buy and read The Official Handbook of the Marvel Universe.