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 (Mar-Vell) current. This had the effect of requiring DC Comics, which in the meantime licensed the original Fawcett Captain Marvel for publication, to print its new comics under the trademark "Shazam!" Comics historian Don Markstein states, "Marvel didn't seem to quite know what to do with him—but they did put his comic out every other month through most of the 1970s, if only to maintain their trademark on his name." When "Captain Marvel" was cancelled with issue #62 (May 1979), there were five as-yet unpublished issues already complete or near-complete. The series "Marvel Spotlight" was revived for the express purpose of