Captain Marvel (DC Comics) Comics" #21 (1941) introduced the Lieutenant Marvels: three other boys named "Billy Batson" who could also become adult superheroes. Captain Marvel, Jr., the alter-ego of disabled newsboy Freddy Freeman, debuted in "Whiz Comics" #25 (1941). Mary Marvel, alter-ego of Billy's twin sister Mary Batson, first appeared in "Captain Marvel Adventures" #18 (1942). In contrast to Captain Marvel and the Lieutenants, both Mary Marvel and Captain Marvel, Jr. remained kids in superhero form, and were given their own eponymous books in addition to appearing as the lead features in "Master Comics" and "Wow Comics", respectively. Captain Marvel, Captain Marvel Jr., and
Captain Marvel (DC Comics) its comic book staff. Otto Binder and Kurt Shaffenberger ended up at DC, becoming prominent members of the creative team for the Superman-related comics from 1954 through the 1960s. Shaffenbeger snuck an unauthorized cameo by Captain Marvel into a story in "Superman's Girl Friend, Lois Lane" #42 in 1963. "Whiz Comics" had ended with issue #155 in June 1953, "Captain Marvel Adventures" was canceled with #150 in November 1953, and "The Marvel Family" ended its run with #89 in January 1954. Hoppy the Marvel Bunny was sold to Charlton Comics, where a few Fawcett-era stories from that strip were reprinted