Showcase Presents: Justice League of America #3
In "Earth--Without a Justice League!", the Justice League of America teams up with the Justice Society of America to confront the Black-Sphered Villains on Earth-2, where artificial black matter temporarily empowers four heroes—pushing them dangerously close to corruption. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Sid Greene and lettering by Gaspar Saladino, this 2008 Showcase Presents issue delivers a tense, high-stakes crossover where even the heroes' own subconscious resolve becomes a weapon. The cover, by Carmine Infantino and Murphy Anderson, captures the moment of crisis with dramatic flair.
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The JLA and JSA team up to stop the Black-Sphered Villains on Earth-2, using artificial means to power up four of their own with black matter, but it almost backfires when the four heroes become evil. The remaining heroes are then subconsciously helped by the four heroes into defeating them by exposing their weaknessses. These same weaknesses are then used versus the four earlier-charged normal persons, who then lose their powers as well. Things are returned to normal on Earth-2, and the four Leaguers return to their world to stop the charged persons there using the same weaknesses.
Plot details indexed by the Grand Comics Database (CC BY-SA).