Justice League of America #70

In "Versus the Creeper!", the Justice League finds itself at a crossroads as they debate the true nature of the mysterious and unpredictable Creeper. Meanwhile, Mind-Grabber Kid, frustrated by the League’s fame, unwittingly arms a hostile alien force with the belief that the heroes are tyrants—setting the stage for a crisis that tests loyalty, perception, and the line between hero and villain. Written by Denny O'Neil and illustrated by Dick Dillin with inks by Sid Greene, this 1969 classic features a cover by Neal Adams that captures the tension perfectly.