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 Jr. of World War II-era comic stories. Immediately following the crossover chapters in "Master Comics" #21–22, Captain Marvel Jr. began starring in the series with issue #23 (February 1942). His own "Captain Marvel Jr." comic book launched nine months later. Mac Raboy's darker, more dramatic art style illustrated adventures with more serious themes than those often seen in the often whimsical Captain Marvel stories. Marvel Jr's regularly dealt with espionage, organized crime, murder, and Nazis in more-or-less straightforward adventure styles with often somber overtones. The stories depicted the plight of working class and working poor people during World War II. Even