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
Hasbro Comic Book Universe universe entirely. Hasbro Comic Book Universe The Hasbro Comic Book Universe (HCBU) is an American comic book franchise and shared universe created and published by IDW Publishing, based on various properties of the toy company Hasbro. Following the bankruptcy of Dreamwave Productions in 2005, IDW picked up the "Transformers" comic book license and hired veteran writer Simon Furman to craft a rebooted continuity based on the toy line, similar to what Marvel Comics did through Ultimate Marvel. In May 2008, IDW obtained the "G.I. Joe" comic book license from Devil's Due Publishing. In 2016, IDW gained the rights of "Rom",