Justice League of America #30
In "The Most Dangerous Earth of All!", the Justice League of America faces their most dangerous challenge yet when the Crime Syndicate of America hijacks the JSA’s dimensional journey, trapping them in an interdimensional prison. With Earth-2 at stake, the JLA must confront their evil counterparts in a battle that pushes both teams to their limits. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Bernard Sachs and lettering by Milt Snapinn, the issue’s cover by Mike Sekowsky and Murphy Anderson captures the tension of a universe teetering on the edge.
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The JSA is tricked into being transported to an interdimensional prison by the Crime Syndicate (using the same word 'Volthoom' that captured the JLA last issue), so the JLA must battle the Crime Syndicate on Earth-2. The JLA then gets the Syndicate to over-exert themselves, imprisons them between the dimensions, and later frees the JSA from their dimensional trap set by the Syndicate to destroy the earths should they have lost vs. both teams.
Plot details indexed by the Grand Comics Database (CC BY-SA).