Justice League of America #14

In "The Menace of the 'Atom' Bomb!", the Justice League makes a surprising decision: they unanimously vote to admit the Atom—only to realize they have no idea who he is. With Green Lantern’s Power Ring as their only clue, the team tracks down the mysterious hero in Ivy Town, only to find him suffering from amnesia. As the League is captured by the cunning Mister Memory and his de-memorizer, the Atom becomes their last hope—though he can’t even remember his own name. 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 Murphy Anderson that captures the suspense perfectly.