Aquaman #13

From 1964 comes this vivid Nick Cardy cover that throws Aquaman and Aqualad into immediate peril — the King of the Seas is face-down in the churning waves while a frightened Aqualad is trapped inside a watery bubble conjured by a red-haired, green-costumed figure looming overhead. That figure is Mera, and the cover's speech bubbles make the stakes unmistakable: she's declared herself a sea witch and set her sights on Aquaman next. With its striking golden-orange backdrop and a massive, many-eyed creature coiled menacingly across the scene, this issue promises the kind of colorful underwater drama that made DC's early Silver Age titles so irresistible.