Justice League of America #55

In "The Super-Crisis That Struck Earth-Two!", the Justice Society of America—now including an adult Robin—faces a shocking defeat at the hands of four ordinary people on Earth-2, all empowered by mysterious black matter from another universe. When the JSA calls on the JLA for help via Johnny's T-Bolt, they're met with a battered League suffering the same strange affliction. With the threat spreading across dimensions, both teams must uncover the source of the black matter before both Earths are lost. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Sid Greene and lettering by Gaspar Saladino, the cover by Mike Sekowsky and Murphy Anderson captures the tension of a world on the brink.