Namor, the Sub-Mariner #15

Namor strides boldly into Marvel's prehistoric wilderness in this June 1991 issue, with the cover by John Byrne placing the bare-chested Sub-Mariner atop a winged, lion-headed creature while a towering red pterosaur looms nearby — the Savage Land living up to its name in vivid, unsettling fashion. The corner box also reminds us this issue arrived during Marvel's 50th anniversary celebration of Captain America, adding a little extra context to a wild ride. If you've ever wanted to see "Marvel's First and Mightiest Mutant" face creatures that look like they crawled out of a fever dream, this one delivers the mood right on its cover.