Justice League of America 21 (Facsimile Edition) #[nn]

In "Crisis on Earth-One!", the Justice League of America faces a cunning threat as Earth-1 and Earth-2 villains conspire to evade capture by crossing dimensions. With the League trapped in their own HQ, they summon the Justice Society of America to take their place—leading to a high-stakes swap that tests both teams' resolve. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Bernard Sachs and lettering by Gaspar Saladino, this facsimile edition captures the classic energy of a landmark era. The cover, penciled by Sekowsky and inked by Murphy Anderson, perfectly frames the escalating tension.