The Justice Society of America, precursor to the Justice League, was the first comic book superhero team, first appearing in 1940's All Star Comics #3. As the years went by, DC would introduce the concept of alternate Earths with the JSA belonging to Earth 2 while the JLA was formed on Earth 1. The teams would join forces regularly during epic "Crisis" crossover events. In spite of being first, the JSA has been less favored by onscreen media, owing in part the team's membership of lesser known heroes compared to those on the Justice League.
