"Crisis in the 30th Century"
In order to gain more power, the sorcerer Mordru plans to unleash three demons on Earth. In order to release the demons, Mordru needs assistance from three "accomplices" to recover three magical items. Despite the finite resources available to him, he manages to capture members of the Legion of Super-Heroes, the Justice League and the Justice Society.
(Note: This story features the Flash, Hawkman and Green Lantern of Earth-2.)
"100 Issues Ago.."
Two reprinted pages from Justice League of America #47