Captain Marvel #51

Marvel's spaceborn superhero faces a serious threat in this July 1977 installment, as the cover — penciled and inked by Al Milgrom — depicts Captain Marvel locked in fierce close-quarters combat with Mercurio the 4-D Man, whose flames lick across the rooftop setting while the two figures grapple with raw intensity. The bold tagline "The Hour of Flame and Frost!" captures the elemental clash on display, with Mercurio's fiery power set against Captain Marvel's cosmic resilience in a collision that looks anything but survivable. Writer Scott Edelman and artist Al Milgrom deliver a story titled "'Til Death Do Us Part!" — and if this cover is any indication, that title carries some real weight.