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 Jr. a Marvel-esque lightning bolt insignia) also show inspiration from Captain Marvel Jr. Elvis's childhood collection of "Captain Marvel Jr." comic books still sits in the attic at his Graceland estate in Memphis, Tennessee, with a copy of "Captain Marvel Jr." #51 (1947) placed on the desk in the recreation of his childhood room at Memphis' Lauderdale Courts housing complex. In reference to Elvis's admiration for the character, Captain Marvel Jr. has often been shown as either a fan of Elvis or having been inspired by Elvis. In "Teen Titans" (vol. 3) #23, Captain Marvel Jr. is revealed to be a