The Invincible Iron Man #54 (1973)

"Sub-Mariner: Target for Death!" Story by Mike Friedrich and Bill Everett. Art by George Tuska and Vince Colletta. Cover by Gil Kane. Sub-Mariner and Iron Man do battle. It's a cataclysmic confrontation between Iron Man and the Sub-Mariner off the coast of Seattle! One of the heroes is being forced to fight against his will, but which one? And once the battle moves underwater, does Shell-Head have a chance to defeat Namor?

Key book; first appearance of Madame MacEvil, daughter of Drax, later referred to by the name Moondragon; Madame MacEvil becomes Moondragon in Daredevil #105; Rumored to appear in the MCU.  Good condition