Justice League of America #56

In "The Negative Crisis on Earths One-Two!", the Justice League of America joins forces with the Justice Society of America to confront the Black-Sphered Villains on Earth-2, where artificial black matter dangerously empowers four heroes—nearly turning them to villains. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Sid Greene and lettering by Gaspar Saladino, this 1967 issue delivers a tense, mind-bending crossover where the heroes’ own subconscious strength becomes the key to victory. The cover by Carmine Infantino and Murphy Anderson captures the cosmic stakes with striking precision.