Superman's Pal, Jimmy Olsen #97

Set inside Superman's Fortress of Solitude, this October 1966 cover by Curt Swan and George Klein puts Jimmy Olsen in a desperate spot — armed with a Kryptonite Flame Gun, he's firing a bright green energy blast at a menacing, purple-clad villain who boasts that not even Superman's most powerful weapons can harm him. Superman himself stands calmly in the background, making the threat feel all the more unsettling, while scattered alien weapons on the floor hint at how thoroughly Jimmy has already tried — and failed — to stop this intruder. Featuring the story "The Fortress Death-Trap!" with writing by Jim Shooter and art by Pete Costanza, this issue captures the silver-age formula at its most fun: Jimmy Olsen, man of action, in way over his head.