Captain America #20

Part 4 of "The Iron Nail" arrives with a cover that demands your attention — a towering, monstrous creature clutches Captain America's shattered shield in both clawed hands, glowing red eyes blazing with menace against a fiery orange backdrop. Nic Klein's cover art is viscerally striking, the fractured star-spangled shield serving as a powerful visual shorthand for the threat Steve Rogers faces in Rick Remender's ongoing run. If this image is any measure of where the story is headed, issue #20 is not a place for the faint of heart.