Justice League of America #15
In "The Challenge of the Untouchable Aliens!", Superman and Wonder Woman race to protect the Satellite Sky Fortress from a deadly threat, only to discover a mysterious cannon aimed at Central City. When The Flash spots the danger, the duo destroys the weapon and calls upon the Justice League to confront a global mystery: stone giants that defy all physical contact. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Bernard Sachs and lettering by Gaspar Saladino, this 1962 classic features a cover by Mike Sekowsky and Murphy Anderson.
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Superman and Wonder Woman save the Satellite Sky Fortress, and The Flash sees its cannon aiming at a skyscraper in Central City. Superman and Wonder Woman destroy it, and they summon the Justice League. Searching the world, they find stone giants that can't be touched.
Plot details indexed by the Grand Comics Database (CC BY-SA).