The members of the Justice Society of America play a huge role in Black Adam and have a variety of origins and powers. The superhero team, commonly referred to as JSA, first appeared in DC's All-Star Comics #3 in 1940 and featured the lineup of Doctor Fate, Hourman, The Spectre, Sandman, Atom, Flash, Green Lantern, and Hawkman. The new trailer for Black Adam features the members featured in the film, but the team would shift frequently throughout the many decades it would appear in the comics, rotating new and old members out regularly. The JSA actually predated the Justice League by two decades, standing as the first DC superhero team.
The JSA has had multiple live-action iterations as well, appearing in a variety of different DC-themed shows throughout the years. In animated form, the JSA has appeared in the Justice League series, Batman: The Brave & The Bold series, and the Young Justice series. The team has also been featured in the DC direct-to-video animated films Justice League: New Frontier and Justice Society: WWII. In live-action, the JSA has appeared in a number of different shows with differing (and similar) members, including CW's Smallville and Legends of Tomorrow, as well as the DC Universe series Stargirl. A consistent thread between all the early live-action appearances is that the JSA is a secret organization that's been around for a long time, emerging in the present day to help with a specific problem.
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Black Adam's involvement with the JSA didn't happen until the late '90s in the pages of JSA where he fought against the superhero group before eventually joining their ranks and forming a close bond with Atom Smasher, who he treats as the brother he never
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