DC started the Golden Age of comics with the introduction of Superman in 1938, but superheroes had fallen out of favor by the end of World War II. Eventually, DC decided to bring back those Golden Age heroes by establishing that they live on Earth-2, where Jay Garrick is the Flash, Alan Scott is Green Lantern, and so on. When DC combined the Earths in the Crisis, they established that the Golden Age heroes were predecessors to the Silver Age heroes, and kept them around as older mentors. Earth-4Earth-4 is the world most likely to show up on Peacemaker because it is, in the larger DC Comics cosmology, Christopher Smith’s original home. Charlton stopped publishing superheroes in 1967 and, in 1983, the characters were acquired by DC Comics.