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
Adventures of Captain Marvel the usage in the "Superman" TV series, two Captain Marvel tunics were worn by actors in early episodes of the pioneering U. S. science fiction TV series "Space Patrol". Very early into the series, those Marvel tunics were replaced by custom made shirts. At the Science Fiction Museum and Hall of Fame in Seattle, WA, one of the remaining Captain Marvel tunics is on public display. "Adventures of Captain Marvel"s official release date was March 28, 1941, although this is actually the date the sixth chapter was made available to film exchanges. The serial was re-released on April 15, 1953,