Captain Marvel (DC Comics) abilities. Based on book sales, the character was the most popular superhero of the 1940s, outselling even Superman. Fawcett expanded the franchise to include other "Marvels", primarily Marvel Family associates Mary Marvel and Captain Marvel Jr., who can harness Billy's powers as well. Captain Marvel was also the first comic book superhero to be adapted into film, in a 1941 Republic Pictures serial titled "Adventures of Captain Marvel". Fawcett ceased publishing Captain Marvel-related comics in 1953, partly because of a copyright infringement suit from DC Comics, alleging that Captain Marvel was a copy of Superman. In 1972, DC licensed the
Captain Marvel (DC Comics) "Earth-S". The Fawcett material was still considered canon, with the Marvel Family's 20-year layoff explained in the comic as time spent in suspended animation due to Doctor Sivana. While the series began with a great deal of fanfare, the book had a lackluster reception. The creators themselves had misgivings. Beck said, "As an illustrator, I could, in the old days, make a good story better by bringing it to life with drawings. But I couldn't bring the new [Captain Marvel] stories to life no matter how hard I tried". "Shazam!" was heavily rewritten as of issue #34 (April 1978), and