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) "Split!" and reassembled himself by shouting "Xam!" He had a young human ward named Billy Baxton. This short-lived Captain Marvel was credited in the comic as being "based on a character created by Carl Burgos". Legal issues with Marvel Comics over the use of "Marvel" in the title led to M.F. ceasing publication after five issues, and accepting a $4500 settlement from Marvel. When superhero comics became popular again in the mid-1960s in what is now called the "Silver Age of Comic Books", Fawcett was unable to revive Captain Marvel, having agreed to never publish the character again as part